Quick Answer: How do the random distribution of chromosomes and crossovers create more variation in the resulting gametes?

How do the random distribution of chromosomes and crossovers create more variation in the resulting gametes quizlet?

Independent assortment is the idea that the way one pair of homologous chromosomes separates into gametes does not affect the way another pair separates. It makes it so that each gamete could get many different combinations of chromosomes, and that is one basis for variation.

How do the random distribution of chromosomes create more variation in the resulting gametes?

When cells divide during meiosis, homologous chromosomes are randomly distributed during anaphase I, separating and segregating independently of each other. This is called independent assortment. It results in gametes that have unique combinations of chromosomes.

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How does crossover increase genetic variation?

Crossing over is a process that happens between homologous chromosomes in order to increase genetic diversity. During crossing over, part of one chromosome is exchanged with another. … Gametes gain the ability to be genetically different from their neighboring gametes after crossing over occurs.

What process produces genetic diversity through random distribution of chromosomes?

During prophase of meiosis I, the double-chromatid homologous pairs of chromosomes cross over with each other and often exchange chromosome segments. This recombination creates genetic diversity by allowing genes from each parent to intermix, resulting in chromosomes with a different genetic complement.

How does crossing over and independent assortment increase genetic variation?

Independent assortment produces new combinations of alleles.

In meiosis I, crossing over during prophase and independent assortment during anaphase creates sets of chromosomes with new combinations of alleles. Genetic variation is also introduced by random fertilization of the gametes produced by meiosis.

How does independent assortment increase the variation?

Genetic variation is increased by meiosis

Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. … A gamete will end up with 23 chromosomes after meiosis, but independent assortment means that each gamete will have 1 of many different combinations of chromosomes.

What process creates genetic variation?

Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism’s offspring).

How and at what stage do chromosomes undergo independent assortment?

When cells divide during meiosis, homologous chromosomes are randomly distributed during anaphase I, separating and segregating independently of each other. This is called independent assortment. It results in gametes that have unique combinations of chromosomes.

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What is random fertilization?

Random fertilization refers to the fact that if two individuals mate, and each is capable of producing over 8million potential gametes, the random chance of any one sperm and egg coming together is a product of these two probabilities – some 70 trillion different combinations of chromosomes in a potential offspring.

How does crossing over contribute to genetic variation quizlet?

In crossing over, genetic information is exchanged between homologous chromosomes. This exchange creates new combinations of genes, leading to increased genetic variation in the offspring.

Is the location of crossing over random or does it occur more frequently in any particular location?

The basic reason is that crossovers between two genes that are close together are not very common. Crossovers during meiosis happen at more or less random positions along the chromosome, so the frequency of crossovers between two genes depends on the distance between them.

When homologous chromosomes crossover What is the result quizlet?

When homologous chromosomes crossover, what occurs? A) Two chromatids get tangled, resulting in one re-sequencing its DNA.

What process produces genetic diversity through random distribution of chromosomes quizlet?

During prophase of meiosis I, the double-chromatid homologous pairs of chromosomes cross over with each other and often exchange chromosome segments. This recombination creates genetic diversity by allowing genes from each parent to intermix, resulting in chromosomes with a different genetic complement.

Which processes increase variation during meiosis quizlet?

The two factors are: crossing-over and independent assortment. Crossing over: In Prophase I of Meiosis I, homologous chromosomes line up their chromatids and “cross-over”, or exchange corresponding segments of DNA with each other. This produces genetic variation by allowing more combinations of genes to be produced.

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What process produces genetic diversity through random alignment of chromosomes on the metaphase plate?

Meiosis generates variation in the daughter nuclei during crossover in prophase I as well as during the random alignment of tetrads at metaphase I. The cells that are produced by meiosis are genetically unique. Meiosis and mitosis share similar processes, but have distinct outcomes.