Which of the following is not a source of genetic variation?

a. mutations
b. sexual reproduction
c. lateral gene transfer
d. asexual reproduction

D. Asexual reproduction

Explanation:

In the process of asexual reproduction a new organism is produced from a single parent organism. So the new offspring inherits all the genetic traits of a single parent, there is no recombination of genetic traits. However, in sexual reproduction there is recombination of genetic traits so the offspring shows genetic variation.

Asexual reproduction is not a source of genetic variation.

Further Explanation:

A given population can contain different individual with different sequences in DNA. This difference in DNA sequences between the individuals of the same population is known as genetic variation. Genetic variation can occur both in somatic cells as well as germ cells. The major reasons for variations can be mutations and recombination.

The alteration of DNA sequence which can be caused due to error during replication is known as mutation. Mutations can be either point mutation or frameshift mutation. The mixture of genetic material that a person gets from his family is one major source of genetic variation which is termed as the recombination. Sexual reproduction leads to genetic variation.The offspring arising from a single organism without the involvement of fusion of gametes is known as asexual reproduction. There is no chance of genetic variation because there is no chance of recombination. This type of reproduction is usually common and prokaryotes. The types of asexual reproduction are; fission, budding, vegetative propagation, spore formation, fragmentation, parthenogenesis, apomixis and nucellar embryony etc.

There are some organisms which follow both the asexual and sexual reproduction. This ability e is known as heterogamy. Depending upon the conditions this alteration mainly in the rotifer species.

Answer Details:

Grade: High School

Subject: Health

Topic: Reproduction

Learn more:

1. Learn more about cells

2. Learn more about cellular respiration

3. Learn more about cell organelles

Keywords:

Fission, budding, vegetative propagation, spore formation, fragmentation, parthenogenesis, apomixis and nucellar embryony, DNA sequence, alteration, asexual reproduction, sexual reproduction, point mutation, frameshift mutation, lateral gene transfer, recombination.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.