What main process in meiosis ensures genetic variation in the offspring quizlet?

What main process in meiosis ensures genetic variation in the offspring?

Meiosis also produces genetic variation by way of the process of recombination. Later, this variation is increased even further when two gametes unite during fertilization, thereby creating offspring with unique combinations of DNA.

What are the 3 processes in meiosis that contribute to genetic variation?

The three main sources of genetic variation arising from sexual reproduction are: Crossing over (in prophase I) Random assortment of chromosomes (in metaphase I) Random fusion of gametes from different parents.

What is the main source of genetic variation after meiosis?

random mating between organisms. random fertilization. crossing over (or recombination) between chromatids of homologous chromosomes during meiosis.

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Which two stages of meiosis are most responsible for genetic variation?

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.

Which two processes occur during meiosis that ensure variation in the offspring?

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.

What process occurring during meiosis ensures independent assortment?

Recombination occurs during meiosis and is a process that breaks and recombines pieces of DNA to produce new combinations of genes. Recombination scrambles pieces of maternal and paternal genes, which ensures that genes assort independently from one another.

What three processes occur during meiosis?

Three Ways that Genetic Diversity Occurs During Meiosis

  • Meiosis I and II. Meiosis occurs over two generations of cells. …
  • Crossing Over. …
  • Reduction to Haploid. …
  • Random Chromatid Assortment. …
  • Fertilization.

Which process most contributes to genetic variation in a population?

Overall, the main sources of genetic variation are the formation of new alleles, the altering of gene number or position, rapid reproduction, and sexual reproduction.

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.

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What process provides the genetic variability that natural selection acts on during evolution?

Two processes produce the genetic differences that are the basis of evolution: mutation and sexual reproduction. Individual variation occurs in all species, but not all phenotypic variation is heritable.

Which of the following processes contributes to creating genetic variability in the offspring?

Meiosis involves two divisions and produces four nonidentical gametes. Which of the following processes contributes to creating genetic variability in the offspring? … meiosis produces haploid gametes, and fertilization creates a diploid cell that divides by mitosis to produce a new individual.

Where does the genetic variation come from?

Mutations, the changes in the sequences of genes in DNA, are one source of genetic variation. Another source is gene flow, or the movement of genes between different groups of organisms. Finally, genetic variation can be a result of sexual reproduction, which leads to the creation of new combinations of genes.

What happens during each stage of meiosis?

Prophase II: Starting cells are the haploid cells made in meiosis I. Chromosomes condense. Metaphase II: Chromosomes line up at the metaphase plate. Anaphase II: Sister chromatids separate to opposite ends of the cell. Telophase II: Newly forming gametes are haploid, and each chromosome now has just one chromatid.

Which two phases of meiosis are most responsible for the variation in gametes 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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How does meiosis contribute to genetic recombination?

When recombination occurs during meiosis, the cell’s homologous chromosomes line up extremely close to one another. Then, the DNA strand within each chromosome breaks in the exact same location, leaving two free ends. Each end then crosses over into the other chromosome and forms a connection called a chiasma.