i asking question for my sister again

how r gene combina tions reshufled?

my sister and i find this paragraph online but we not able to get answer.

Sex can introduce new gene combinations into a population and is an important source of genetic variation.

You probably know from experience that siblings are not genetically identical to their parents or to each other (except, of course, for identical twins). That's because when organisms reproduce sexually, some genetic "shuffling" occurs, bringing together new combinations of genes. For example, you might have bushy eyebrows and a big nose since your mom had genes associated with bushy eyebrows and your dad had genes associated with a big nose. These combinations can be good, bad, or neutral. If your spouse is wild about the bushy eyebrows/big nose combination, you were lucky and hit on a winning combination!

This shuffling is important for evolution because it can introduce new combinations of genes every generation. However, it can also break up "good" combinations of genes.

Since we don't have a regular biology tutor, try posting this question in this forum.

http://www.biology-online.org/biology-forum/

ok thanks ms. sue :)

You're welcome, Mohammad.

The paragraph you found online provides a good explanation of how gene combinations are reshuffled during sexual reproduction. Let's break it down further to understand it better.

When organisms reproduce sexually, they inherit genetic material from both their parents. This genetic material is stored in genes, which are segments of DNA responsible for specific traits. Each parent contributes one set of genes to their offspring.

During the formation of reproductive cells (sperm and eggs), a process called meiosis takes place. Meiosis involves the mixing and dividing of genetic material. During this process, chromosomes (thread-like structures that contain genes) exchange and rearrange segments of DNA. This exchange results in the creation of new combinations of genes in the reproductive cells.

When two reproductive cells (sperm and egg) with different gene combinations come together during fertilization, they form a new individual with a unique set of genes. This new individual is a combination of traits from both parents.

The purpose of this genetic "shuffling" is to introduce genetic variation into a population. Genetic variation is important for evolution because it allows for new combinations of genes to arise in each generation, which can potentially result in individuals with advantageous traits. Some of these new combinations may be beneficial, enhancing the survival and reproductive success of individuals.

At the same time, this shuffling can also break up "good" combinations of genes that have been beneficial in the past. This is due to the random nature of gene recombination during meiosis. Sometimes, beneficial gene combinations may be separated as a result of the shuffling process, leading to a loss of advantageous traits in certain individuals.

In summary, gene combinations are reshuffled during sexual reproduction through the process of meiosis, which involves exchanging and rearranging segments of DNA. This reshuffling generates new combinations of genes in each generation, promoting genetic variation in a population.