How many different allele combinations would be found in the gametes produced by a pea plant whose genotype was RrYY? A) 16 B) 8 C) 4 D) 2

QUESTION POSTED AT 13/11/2019 - 05:21 PM

Answered by admin AT 13/11/2019 - 05:21 PM

Answer: The correct answer is D) 2

Th genotype of the pea plant is RrYY, which shows that it has two genes that are corresponding to two different traits that are color ( Rr) and shape ( YY) of the seed.

During gamete formation, the alleles ( different forms of gene like R and r here) of these genes are segregated and enter in the gametes. There are two allele for the gene corresponding to color that is R and r, whereas gene for shape has only one type of allele that is Y.

Two different type of allelic combinations are found ( refer attachment) in the gametes, which are RY and rY.

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Related questions

14. A pyramid of numbers differs from an ecological pyramid because it A. is organized by trophic levels, while an ecological pyramid isn't. B. attempts to describe a food chain or food web. C. shows the amount of energy within each trophic level. D. displays the number of organisms at each trophic level. I put B and got it wrong.

The right option is D. displays the number of organisms at each trophic level

A pyramid of numbers differs from an ecological pyramid because it  displays the number of organisms at each trophic level.

Pyramid of numbers refers to when the number of organisms in a food chain is represented graphically in a pyramid. Each bar of the graph displays the number of organisms at each trophic level in the food chain.

An ecological pyramid is a graphical representation that shows the interaction between the different organisms in an ecosystem. Ecological pyramids start at the bottom and moves to various trophic levels in the food chain.


ANSWERED AT 15/12/2019 - 11:11 PM


QUESTION POSTED AT 15/12/2019 - 11:11 PM

5. Unlike an animal's habitat, an animal's niche can be described by all of the following except A. the place in which the species lives. B. the job the organism has within its environment. C. the way the species obtains what it needs to reproduce. D. the way the species obtains what it needs to survive. Someone please help I put C and got it wrong

Answer:

The correct answer would be A. the place in which the species lives.

A habitat is defined as a general place or physical area in which an organism lives.

In contrast, the niche is defined as a role any species plays in an environment. It includes all the physical and biological interactions made by the organism. For example, how organisms obtain its nutrition and its role in the flow of the energy through the ecosystem, and how it obtains all the necessary substances for its reproduction.

Thus, in contrast to habitat, niche can be explained by all of the following except  the place in which the species lives.

ANSWERED AT 15/12/2019 - 11:11 PM


QUESTION POSTED AT 15/12/2019 - 11:11 PM

Which term is the name of the diploid stage of the plant life cycle?

Answer:

Sporophytic stage

Explanation:

The life cycle of plants is in two distinct phases, in which the dominance of either phase is dependent on the phylum of plant involved.

The gametophytic phase involves the production of haploid(n) male and female gametes by the gametophyte (undergoes cell division/meiosis to form gametes). The fusion of these two gametes results in fertilization, which forms a diploid (2n) zygote. The zygote develops into an embryo and ultimately a sporophyte (2n). The dynamics between these two stages in plant is referred to as alternation of generations.

ANSWERED AT 15/12/2019 - 11:06 PM


QUESTION POSTED AT 15/12/2019 - 11:06 PM

Which of the following phase changes would release energy as it occurs? A. Melting B. Evaporation C. Boiling D. Condensing


B evaporation because the partacals r moveing

 

ANSWERED AT 15/12/2019 - 11:06 PM


QUESTION POSTED AT 15/12/2019 - 11:06 PM

What is the function of the phytoplankton in ocean ecosystems? a. producer b. consumer c. scavenger d. decomposer

Phytoplankton is the producer in ocean ecosystems. 

ANSWERED AT 15/12/2019 - 11:04 PM


QUESTION POSTED AT 15/12/2019 - 11:04 PM

Because mood disorders such as depression substantially increase the risk of suicide, ________ is a matter of serious concern for clinicians. A. Suicidal behavior B. Poor study habits C. Peer pressure D. Earning bad grades

Because mood disorders such as depression substantially increases the rick of suicide and suicidal behavior is a matter of serious concern for civilians. A 

ANSWERED AT 15/12/2019 - 10:58 PM


QUESTION POSTED AT 15/12/2019 - 10:58 PM

Waterweed grows near the surface of the water in lakes and ponds. It often grows in dense clumps. It has been observed that the chloroplasts in this plant move around inside the cell. How might this be an advantage and a disadvantage to the plant?

This might be an advantage because the Chloroplast can orient themselves so as to obtain maximum exposure to sunlight for the process of photosynthesis. It can also be a disadvantage because useful energy would be required to relocate the chloroplasts which could have been used elsewhere

Explanation; 
Chloroplasts are organelles where the process of photosynthesis, the process in which green plants make their own food, takes place. For maximum photosynthesis to take place the chloroplasts require maximum exposure to sunlight, therefore, the chloroplasts in the waterweed are able to achieve this, since they are moving around the cell, which is advantageous to the plant. However, this movement would cause unequal distribution of light as not all cells will be exposed to maximum sunlight and again the movement of the chloroplasts within the cell requires energy that would have otherwise been used by the cell for other activities. 


ANSWERED AT 15/12/2019 - 10:57 PM


QUESTION POSTED AT 15/12/2019 - 10:57 PM

Edward Jenner discovered vaccinations. He found that some of the dairymaids who worked with cows had suffered lesions on their hands, and that these dairymaids were immune to the more severe smallpox. Then, he inoculated James Phipps with material from the lesions on a dairymaids’ hands. Which best explains why Jenner decided to infect Phipps?

To analyze why he inoculates the boy, you need to analyze what happens with vaccines.

A vaccine is a solution with a decreased or dead virus. Our body recognizes that virus and creates anti-viruses. If you get the infection, your body already knows how to kill that antigen.

Edward Jenner saw that dairymaid gets affected by cow's version of smallpox, only on their hands, and then they don't suffer human smallpox.

He wants to prove that, without knowing what we call immunization now, and inoculate the boy.

ANSWERED AT 15/12/2019 - 10:56 PM


QUESTION POSTED AT 15/12/2019 - 10:56 PM

Unlike toads, tortoises a. have amniotic eggs. b. have lungs. c. have true bone. d. have jaws and paired appendages.

The correct answer is (a) have amniotic eggs.

Unlike toads, tortoise have amniotic eggs. Tortoise eggs are surrounded by four fluid filled membranes, chorion, amnion, yolk sac and allantois. Amnion is absent in toad eggs.The amnions acts a cushion for the protection of the developing embryo from the physical damage. These kinds of eggs that contain amnion is called amniotic eggs.






ANSWERED AT 15/12/2019 - 10:53 PM


QUESTION POSTED AT 15/12/2019 - 10:53 PM

Which of the following steps is an important part of the process by which ecology guides humans to a sustainable future? A.Behavior is modified as a cause. B.the problems plaguing ecology are ignored. C.Bahavior remains unchanged after the root of a problem is identified. D.the causes behind problems aren't identified or studied. I got my answer wrong when I choose C please anyone help

The correct option for above statement is:

A.Behavior is modified as a cause.

Explanation:


Behavior modification may be a therapeutic approach designed to alter a specific undesirable negative behavior. By employing a system of positive or negative consequences, a private learns the proper set of responses for any given stimulation.

ANSWERED AT 15/12/2019 - 10:50 PM


QUESTION POSTED AT 15/12/2019 - 10:50 PM

Which structures are found in both plant and animal cells? a. a cell membrane and genetic material b. lysosomes and ribosomes c. a nucleus and chloroplasts d. vacuole and ribosomes

The answer to this question is (A. a cell membrane and genetic material)
Also to let you know its not supposed to be genetic material, its supposed to be a nucleus!

The answer should be this a. a cell membrane and a nucleus

ANSWERED AT 15/12/2019 - 10:50 PM


QUESTION POSTED AT 15/12/2019 - 10:50 PM

Unlike secondary succession, primary succession A. occurs in an area where existing communities still exist. B. leads to an increased number of different species over time. C. has the challenge of occurring in areas where no community exists at all. D. proceeds at a much faster rate.

Answer:

The correct answer would be C. has the challenge of occurring in areas where no community exists at all.

Primary succession is a type of ecological succession which in an environment which lacks soil, vegetation, or other organisms.  

In other words, it occurs in the area where no community exists at all due to which it takes a longer period of time to develop an ecosystem.

Pioneer species include algae, lichens, and fungi which are gradually replaced by small plants such as grasses and shrubs.  

Nutrients and water level increase gradually with the progression of succession and grasses, herbs, ferns, and trees accumulate the area.  

It attracts different animals which leads to the development of a complex community.

ANSWERED AT 15/12/2019 - 10:48 PM


QUESTION POSTED AT 15/12/2019 - 10:48 PM

Which of the following correctly pairs labels of animals with the way they feed? A. Filter feeders – strain food from water B. Carnivores – eat plants C. Parasites – help other animals and in turn are rewarded with food D. Herbivores – eat bits of decaying matter

Answer:

The correct answer would be A. Filter feeders – strain food from water.

Filter feeding is a type of food acquirement in which suspended food material and/or small organisms are strained randomly from the water.  

It is accomplished by passing water through the specialized filtering structure.

Examples of filter feeder may include krill, clams, baleen whale, sponges, and many fishes. Few birds like a flamingo and some species of duck also practice filter feeding.

These organisms are considered as ecosystem engineers as they play a crucial role in cleaning water.

ANSWERED AT 15/12/2019 - 10:47 PM


QUESTION POSTED AT 15/12/2019 - 10:47 PM

Which of the following flower parts is male? a. Style b. Stamen c. Carpel d. Ovary

The correct and only answer is B.Stamen are the male part of the flower

ANSWERED AT 15/12/2019 - 10:46 PM


QUESTION POSTED AT 15/12/2019 - 10:46 PM

Plants use carbohydrates to build things such as cellulose. How do plants acquire these building blocks to build mass? a. They absorb carbohydrates through the soil. b. They absorb dissolved carbohydrates via water. c. They make carbohydrates through the process of photosynthesis. d. They make carbohydrates through the process of cellular respiration.

Plants make carbohydrates through the process of photosynthesis. When the leaves of the plants absorb the sunlight, they use this energy to combine water with carbon dioxide. The by-products of mixing carbon dioxide and water are glucose and cellulose.

Photosynthesis is a unique trait that separate plants from other living organisms. They can provide the necessary nutrients to help sustain themselves and survive for longer periods of time. When carbohydrates are in excess, plants have the ability to store and use them when one of the ingredients of photosynthesis is not available. 

ANSWERED AT 15/12/2019 - 10:44 PM


QUESTION POSTED AT 15/12/2019 - 10:44 PM

Which of the following structures is most likely to be found in an autotrophic protist? a. A gullet b. A chloroplast c. A food vacuole d. A plasmodium

The right answer is the chloroplast.

Autotrophic species must stock up on food in order to have energy at all times.

Plants, for example, through their chloroplasts make sugar with the energy of sunlight and from soil water and carbon dioxide from the air. This sugar synthesis using light is photosynthesis.

ANSWERED AT 15/12/2019 - 10:43 PM


QUESTION POSTED AT 15/12/2019 - 10:43 PM

What do the moss life cycle and the fern life cycle have in common? A) Double fertilization produces a 3n cell B)Seeds are protected and nourished by a fruit C)The zygote is the first cell of the gametophyte phase D) Fertilization produces a diploid cell.

Answer;

D) Fertilization produces a diploid cell.

Explanation;

In mosses;  A single spore germinates to form a branched, filamentous protonema, from which a leafy gametophyte develops. The gametophyte bears organs for sexual reproduction. Sperm, which are released by the mature antheridium (the male reproductive organ), are attracted into the neck of an archegonium (the female reproductive organ). Here, one sperm fuses with the egg (fertilization) to produce the diploid zygote.

The life cycle of a fern is very different from the life cycle of many other plants. Ferns have an intermediate stage, called a gametophyte, which then grows into a mature fern. During Gametophyte stge, the spores are produced on the underside of mature plants. These will germinate and grow into small, heart-shaped plants called gametophytes.  The gametophytes produce both sperm and egg cells, and will fertilize itself, or others to yield a diploid cell.

ANSWERED AT 15/12/2019 - 10:43 PM


QUESTION POSTED AT 15/12/2019 - 10:43 PM

A plant with a life cycle that lasts only a year is called a(n) ____ plant. annual perennial yearly monocotyledon

Answer: The correct answer for the fill in the blank is Annual.

Annual plants are those, which complete their whole life cycle starting from germination to the seed production within one year and then they die. In other words, the life cycle of these plants lasts only for one year.

They can be summer annual or winter annual plants.

Example of annual plant- Tomato, Marigold

         

ANSWERED AT 15/12/2019 - 10:41 PM


QUESTION POSTED AT 15/12/2019 - 10:41 PM