How does meiosis ensure genetic diversity?
2007-12-15 07:26:20 · 5 answers · asked by carmelboy91 2 in Science & Mathematics ➔ Biology
Two ways:
1. In prophase I of meiosis the homologous chromosomes synapse and crossing over occurs. This switches sections of two of the sister chromatids so the outer two chromatids have the same mix of alleles as the parents and the inner two chromatids have new combinations of alleles.
2. Meiosis puts only one of each kind of chromosome in the gametes, selecting one of each homologous pair at random. Then when each gamete joins with the gamete from the other parent, there are practically infinite combinations of the alleles possible.
2007-12-15 08:27:42 · answer #1 · answered by ecolink 7 · 7⤊ 0⤋
Genetic Diversity In Meiosis
2017-01-04 07:59:46 · answer #2 · answered by ? 4 · 0⤊ 0⤋
Meiosis Genetic Variation
2016-11-12 02:59:00 · answer #3 · answered by winbush 4 · 0⤊ 0⤋
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During meiosis, unlike mitosis, crossing-over occurs. This is the main mechanism that causes genetic diversity. Crossing-Over Example Chromosomes Before Crossing-Over ABCDEF ABCDEF a b c d e f a b c d e f After the Process of Crossing-Over ABCd e f ABCDe f a b c DEF a b c d EF Crossing-over is another name for recombination or physical exchange of equal pieces of adjacent non-sister chromatids. When crossing-over occurs chromatids break and may be reattached to a different homologous chromosome. During the process of crossing-over one of the paired chromosome arms may exchanged physically at one or more locations. If the two chromosomes contain different mutations on each side of the cross-over the exchange of chromosome arms will produce chromosomes that contain different combinations of mutations. When these chromosomes segregate in meiosis, they form gametes that have completely new combinations of alleles. The source has much more info or search for Crossing Over
2016-04-10 02:37:58 · answer #4 · answered by ? 4 · 0⤊ 0⤋
Meiosis involves two individuals, with their own sets of genetic information. In the process of Meiosis, the alleles are mixed up to create genetic diversity in the making of gametes.
2007-12-15 07:31:43 · answer #5 · answered by ObsidianJenn 2 · 0⤊ 0⤋
in prophase 1 crossing over occur between non sister chromatid and at metaphase 1, the homologous chromosome assort randomly at metaphase plate
2016-03-23 04:18:37 · answer #6 · answered by ? 3 · 0⤊ 0⤋