Quick Answer: What are the two main reasons we can get genetically different gametes?

What are two reasons gametes are genetically different from each other?

This diversity of possible gametes reflects two factors: crossing over and the random orientation of homologue pairs during metaphase of meiosis I.

What are the two factors that produce most of the variation in the gametes?

Genetic variation is increased by meiosis

Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote. Recombination or crossing over occurs during prophase I.

What are 3 reasons to explain genetic variations in meiosis?

Genetic diversity arises due to the shuffling of chromosomes during meiosis.

  • Process of Meiosis. A man produces sperm and a woman produces eggs because their reproductive cells undergo meiosis. …
  • Crossing Over. …
  • Random Segregation. …
  • Independent Assortment.

Why are meiosis cells genetically different?

Specifically, meiosis creates new combinations of genetic material in each of the four daughter cells. These new combinations result from the exchange of DNA between paired chromosomes. Such exchange means that the gametes produced through meiosis exhibit an amazing range of genetic variation.

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What two processes increase genetic variation?

Two processes are responsible for genetic variation, recombination (the subject of this chapter) and mutation. Mutation is the ultimate source of genetic change; new alleles arise in all organisms, some spontaneously, others as a result of exposure to mutagenic agents in the environment.

How do meiosis 1 and 2 contribute to genetic variation quizlet?

During prophase of meiosis I, the double-chromatid homologous pairs of chromosomes cross over with each other and often exchange chromosome segments. … By shuffling the genetic deck in this way, the gametes resulting from meiosis II have new combinations of maternal and paternal chromosomes, increasing genetic diversity.

In what 2 ways does meiosis provide genetic variation explain how each provides genetic variety?

We have seen that meiosis creates variation three ways: crossing over, mutations caused during crossing over, and independent assortment.

Why are the two cells produced by the cell cycle genetically identical?

Why are the two cells produced by the cell cycle genetically identical? The two cells are genetically identical because during S phase an exact copy of each DNA molecule was created. chromatids. Mitosis ensures that each new cell receives one of the two identical sister chromatids.

What is one reason why we need meiosis?

It allows for even distribution of chromosomes in the gametes. It allows for more genetic diversity of gametes. It allows for genetic uniformity of gametes.