Question: Which of the following processes occurs during meiosis and contributes to genetic variation in the offspring?

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 processes in meiosis contribute to 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 of the following events during meiosis contribute to genetic variation in offspring?

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.

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Which of the following processes contributes to genetic variation and occurs during metaphase I?

[One aspect of meiosis that generates genetic variation is the random orientation of homologous pairs of chromosomes at metaphase I. Each pair can orient with either its maternal or paternal homolog closer to a given pole; as a result, each pair sorts into daughter cells independently of every other pair.

What are the 3 processes contribute to genetic variation?

Let’s examine three mechanisms that contribute to the genetic variation arising from sexual reproduction: independent assortment of chromosomes, crossing over, and random fertilization.

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.

How do meiosis I and II contribute to genetic variation quizlet?

Because the duplicated chromatids remain joined during meiosis I, each daughter cell receives only one chromosome of each homologous pair. … 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.

What event occurs during meiosis?

During meiosis one cell? divides twice to form four daughter cells. These four daughter cells only have half the number of chromosomes? of the parent cell – they are haploid. Meiosis produces our sex cells or gametes? (eggs in females and sperm in males).

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When does crossing over occur during meiosis?

Crossing over occurs during prophase I of meiosis before tetrads are aligned along the equator in metaphase I. By meiosis II, only sister chromatids remain and homologous chromosomes have been moved to separate cells.

Which of the following events lead to greater genetic variation and what stage does the event occur in?

The correct option is d. Meiosis is the cell division that introduces genetic variability by means of crossing over.

Which of the following processes contributes to genetic variation and occurs during prophase I?

Genetic variation is increased by meiosis

Recombination or crossing over occurs during prophase I. Homologous chromosomes – 1 inherited from each parent – pair along their lengths, gene by gene. Breaks occur along the chromosomes, and they rejoin, trading some of their genes.

Which event normally contributes to genetic variation?

Meiosis and fertilization create genetic variation by making new combinations of gene variants (alleles).

Which processes lead to most genetic variation?

The process that leads to the most genetic variation in sexually reproducing organisms is crossing over. Meiosis is the process of gamete…

What two processes increase genetic variation?

Genetic variation is caused by:

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

What causes genetic variation?

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.

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