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nekit [7.7K]
3 years ago
11

How does crossing over during meiosis lead to genetic variation?

Biology
1 answer:
jok3333 [9.3K]3 years ago
5 0
Crossing over happens in prophase I when the homologous chromosomes are sy naps ed. The two inner chromoatids exchanges sections with each other. This means that after the exchange the inner two chromatids have new combinations of alleles than their parents had. The two outer chromatids still have the parental combinations.So there are more kinds of chromatids ready to go into the gametes than there were before. This is an increase in variation.
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The very rare Bombay blood phenotype in humans results in blood type O because of the lack of both the A and B antigens in indiv
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The probability that the child will have type blood B equals <u>3/16</u>.

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Punnett square)        IAH            IAh         IBH         IBh

                   IAH      IAIAHH     IAIAHh    IAIBHH   IAIBHh

                   IAh       IAIAHh     IAIAhh     IAIBHh    IAIBhh

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F1) Genotype

  •     1/16 IAIA HH
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  •     2/16 IAIBhh
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  •     2/16 IBIBHh
  •     1/16 IBIBhh

    Phenotype

  •     3/16 Blood type A
  •     6/16 Blood type AB
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What does freshwater storage mean
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