15) Many gardeners use a chemical weed-killer to control plant pests in their gardens. However, many weeds have begun to develop a resistance to these chemical poisons. The resistance that the weeds have developed may be passed down to future generations through _________ . A) apoptosis B) genes C) mitosis D) revolution

QUESTION POSTED AT 26/03/2020 - 01:06 PM

Answered by admin AT 26/03/2020 - 01:06 PM

Answer:

B

Explanation:

A gene is a molecular unit of heredity in all living organisms. Genes are segments of the long-stranded DNA coiled around histone proteins to form Chromosome. Genes hold the information to build and maintain an organism's cell and pass genetic traits to offsprings.

Genetic inheritance, also called heredity, occurs due to the genetic material in form of DNA being passed from parents to their offsprings. The understanding of inheritance began with the work of an Austrian monk called Gregor Mendel, whose experimental discoveries provided the foundation of Modern genetics today. Mendel was accredited as the first person to correctly understand the process of how traits are inherited by offsprings from parents.

In sexual reproduction, the genetic material (contained in the gametes produced by meiosis) of the two parents (male and female) combines and passed on to the resulting offspring (s). When an organism undergoes reproduction, all the information for growth, survival and reproduction for the next generation is found in the DNA passed down from the parent generation.

In this case, the resistance developed by the weeds is a phenotypic characteristics which is encoded for by a gene in the weeds' genome. Hence, they pass down this chenmical-killer resistance trait to their offsprings during reproduction by the means of the genes contained in the gametes produced by meosis.

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Related questions

You develop active immunity to a pathogen by

Active immunity can be natural or artificially developed. Naturally acquired - a person is exposed to a live pathogen, develops an immune response - and then creates memory T and B cells. Artificially acquired - a person is given a vaccine (which contains the antigen). This stimulates the same response, without the symptoms of the disease.





ANSWERED AT 01/04/2020 - 01:49 PM


QUESTION POSTED AT 01/04/2020 - 01:49 PM

Algal blooms occur due to the presence of an excess amount of nutrients, like phosphorus, in fresh water. How does excess phosphorus get into fresh water? A) The nutrients are added to the water by fishermen to feed the fish. B) The nutrients leak into fresh water from oil refineries in the vicinity. C) The nutrients are a part of the fertilizers that are often washed away into ponds. D) The nutrients are formed by the decomposition of organic wastes dumped into fresh water.

The algal blooms can be defined as the rapid growth of the algae in the water bodies. These algal blooms are a result of the excess amounts of nutrients, such as phosphorus, in the water. These excess nutrients are released in the fresh water bodies as a result of the fertilizers that are washed away from the agricultural fields nearby. The fertilizers are rich in nutrients such as phosphorus to help the plant to grow. When they get washed into the water bodies, they promote the growth of the algae leading to algal bloom.

Hence, the correct answer is 'Option C - The nutrients are a part of the fertilizers that are often washed away into ponds'.

ANSWERED AT 01/04/2020 - 01:35 PM


QUESTION POSTED AT 01/04/2020 - 01:35 PM

Zebra mussels are native to Poland and the Soviet Union. They were probably transported to the United States via trans-oceanic vessels. With no natural predators in the United States, zebra mussels A) will eventually die out due to lack of food supplies. B) caused a huge decline in native clam and mussel populations. C) compete unsuccessfully with native mussels and quickly die. D) successfully share the niche with native mussels and clams.

Correct answer: B). Caused a huge decline in native clam and mussel populations.  

The Zebra mussels are the water animals that are D- shell, which is made up of hinged valves that are joined together by a ligament. The main problem with them is that they filter water in order to eat the plankton. As they eat the plankton, it creates a competition between them and fish for food.

They are known to kill mussels population by attaching to their shells, they also out compete for food native mussels.

Hence, the correct answer would be option B.


ANSWERED AT 01/04/2020 - 01:32 PM


QUESTION POSTED AT 01/04/2020 - 01:32 PM

What are examples of the plant life and animal life that can be found in each type of terrarium? Be specific and include many types of life that could be found.

Desert
plants- shrubs get moisture from morning dew

cacti holds a lot of water

elephants tree uses huge trunk to save water
animals coyote has fur to keep cool

tortuous uses back legs to help dig

Jackrabbit uses ears to help cool down

Arctic Tundra-
animal's- polar bear, reindeer, Arctic fox
plants- Arctic Willow, bearberry, Arctic moss

The Savanna
animals- lion, elephant, zebra
plants- Jarrah tree, Jackuberry Tree, Elephant grass

I'm sorry I could not tell u all the information for the biomes. this is all I had time to right

ANSWERED AT 01/04/2020 - 01:32 PM


QUESTION POSTED AT 01/04/2020 - 01:32 PM

Algal blooms occur due to the presence of an excess amount of nutrients, like phosphorus, in fresh water. How does excess phosphorus get into fresh water? A) The nutrients are added to the water by fishermen to feed the fish. Eliminate B) The nutrients leak into fresh water from oil refineries in the vicinity. C) The nutrients are a part of the fertilizers that are often washed away into ponds. D) The nutrients are formed by the decomposition of organic wastes dumped into fresh water.

Answer: Option C

Explanation:

The nutrients that is carried away by the water from the agricultural wastes are part of the fertilizer that is put on to increase the growth of the plants.

The nutrients from the fertilizer is carried away by the water that passed from the field to the nearby freshwater source.

The water carries phosphorus which increases the growth of the algal bloom in water. The algae uses all the oxygen from the water and makes the water deficient of oxygen.

Hence, the correct answer is option C

ANSWERED AT 01/04/2020 - 01:30 PM


QUESTION POSTED AT 01/04/2020 - 01:30 PM

The single MOST important factor contributing to the modern-day extinction of hundreds of species on Earth is A) acid rain. B) invasive species. C) greenhouse effect. D) habitat destruction.

Answer:

The correct answer would be option D. Habitat destruction.

Habitat destruction contributes the most in the loss of biodiversity these days.

More and more space is required to fulfill the demands of increasing human population.

More and more natural habitats are being destroyed for building houses, agriculture, building dams, roads, pipes, industries et cetera.

Consequently, a large number of wild species die due to lack of resources.

ANSWERED AT 01/04/2020 - 01:29 PM


QUESTION POSTED AT 01/04/2020 - 01:29 PM

(2006-27) Bivalves, such as clams, are found in salt water. The clam captures food particles from water that flows over its gills. Which of these is the best classification of the clam? a. A chunk feeder b. A decomposer c. A filter feeder d. A grazer

Answer:

c. A filter feeder

Explanation:

  • Filter feeders are those organisms that feed on the food particles by straining them from water and then taking them in.
  • The straining of water takes place through specialized structures which acts as filters.
  • Since in the given case, the bivalves are capturing the food particles that are flowing over their gills, they are performing filer feeding.

ANSWERED AT 01/04/2020 - 01:27 PM


QUESTION POSTED AT 01/04/2020 - 01:27 PM

The first step in the scientific method is Develop hypothesis Determine problem determine data conclusion research

Hello!

The first step in the Scientific Method is to make objective observations. These observations are based on specific events that have already happened and can be verified by others as true or false.

So in Other Words, Option "A" or 1st in this Case, would be Correct.

Hope this All Helps! Have A Wonderful Night! :)

ANSWERED AT 01/04/2020 - 01:16 PM


QUESTION POSTED AT 01/04/2020 - 01:16 PM

A student has noticed that she can't see objects clearly when they are far away. An eye doctor diagnoses her as being nearsighted. What type of lens could help the student correct her vision problem? A.) Convex lens B.) Flat lens C.) Diverging lens D.) Converging lens

✦ Explanation

The best lens for nearsightedness would be diverging lens. It helps equip the eye to see things clearly when they're far away. 

Answer: Letter C

Hope that helps! ★ If you have further questions about this question or need more help, feel free to comment below or leave me a PM. -UnicornFudge aka Nadia

ANSWERED AT 01/04/2020 - 01:16 PM


QUESTION POSTED AT 01/04/2020 - 01:16 PM

Which group of plants is MOST adapted to live in regions where the layer of soil beneath the surface stays frozen all the time?

Im pretty sure its Xerophyte.

ANSWERED AT 01/04/2020 - 01:15 PM


QUESTION POSTED AT 01/04/2020 - 01:15 PM

Who is at the biggest risk of developing type 1 diabetes A. A 10 yo boy B. A 35 yo woman C. A 50 yo man or D. A 75 yo woman

I believe it is D because as you get older your  risk for developing type 1 diabetes is greater than at a younger age. Type 1 typically affects older individuals whereas type 2 usually affects younger individuals. 

ANSWERED AT 01/04/2020 - 01:10 PM


QUESTION POSTED AT 01/04/2020 - 01:10 PM

The demand on the Earth's lithosphere is dramatically increasing. Why should we look for alternative sources of energy other than just relying on fossil fuels? A) Fossil fuels are non-renewable and exhaustible and their combustion causes air pollution. B) Fossil fuels are renewable and plentiful, but their combustion causes air pollution. C) Fossil fuels are plentiful, so alternative sources are not needed. D) Fossil fuels are not profitable for energy companies.

A. the reason they are called non-renewable resource is that it takes a long time to for them to regenerate-basically longer then our lifespan. Also they do cause air pollution-which is causing the green house affect that is putting the demand on Earth's Lithosphere.

ANSWERED AT 31/03/2020 - 10:48 AM


QUESTION POSTED AT 31/03/2020 - 10:48 AM

In the earliest stages of development the embryos of a fish, calf, human, and tortoise all look similar. In the next stage the fish looks the most different. What assumption can be made based on this different?

The correct assumption may be that the calf, human and the tortoise are more related to one another as compared to the fishes.

The embryology plays a very important role in determining the common ancestors in the organism. The organisms sharing similar embryological development are more closely related as compared to the others, which do not have the similarity in the embryogenesis. More closely related the organism, the more similar embryonic development would be. Hence, it can be said that the calf, human and the tortoise are closely related to one another as compared to the fishes.

ANSWERED AT 31/03/2020 - 10:43 AM


QUESTION POSTED AT 31/03/2020 - 10:43 AM

What two factors have been the GREATEST contributors to the exponential growth of the human population during the last two centuries? A) plentiful food and a mild climate B) the industrial revolution and peace Eliminate C) agricultural developments and peace D) good sanitation and medical advances

Answer: D)  good sanitation and medical advances

In the exponential growth, the population's growth rate increases over time, in proportion to the size of the population. It causes the population to increase faster in numbers. Good sanitation and medical advances will contribute to the exponential growth of the human population because clean environment will prevent the accumulation of pathogen inside the body and hence will prevent the cause of diseases. Medical advances will help in curing of deadly diseases like cancer hence, will increase the likelihood of survival of more number of individuals.  

ANSWERED AT 31/03/2020 - 10:42 AM


QUESTION POSTED AT 31/03/2020 - 10:42 AM

Scientific knowledge is most useful when trying to understand A. art. B. philosophy. C. the natural world. D. religion.

C. The natural world

ANSWERED AT 29/03/2020 - 11:16 PM


QUESTION POSTED AT 29/03/2020 - 11:16 PM

Consider the data summary above. After five weeks, the plants growing in soil containing worms grew an average of?

Answer:

6

Explanation:

ANSWERED AT 29/03/2020 - 06:31 PM


QUESTION POSTED AT 29/03/2020 - 06:31 PM

The amount of mass in a particular volume of water is _____. A. salinity B. density C. pressure D. temperature

I think the answer is b if you are smart you will go with b because the rest of the answer make zero sense.

ANSWERED AT 29/03/2020 - 06:27 PM


QUESTION POSTED AT 29/03/2020 - 06:27 PM

What is the first step that leads to the development of a tumor?

They're caused by malignant cells.  
[...]
It develops when cells in the body split and regenerate at a fast rate.

ANSWERED AT 29/03/2020 - 06:24 PM


QUESTION POSTED AT 29/03/2020 - 06:24 PM