Genetic Variation:Question 8

1 answer:

5 0

Answer: 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).

By the end of meiosis, the resulting reproductive cells, or gametes, each have 23 genetically unique chromosomes. The overall process of meiosis produces four daughter cells from one single parent cell.

Explanation:

During meiosis, homologous chromosomes (1 from each parent) pair along their lengths. The chromosomes cross over at points called chiasma. At each chiasma, the chromosomes break and rejoin, trading some of their genes. This recombination results in genetic variation.

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A husband and wife have normal vision, although both of the couple's fathers are red–green color-blind, an inherited X-linked re

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Answer:

a: 1/4

b: 1/2

c: 1/4

d: 0

Explanation:

Since the wife had a color-blind father (X^cY), she should be a carrier for the disease. Her genotype would be "X^cX". Fathers do not transmit the X-linked disorders to their sons, so the genotype of the husband is "XY".

a. The probability that the couple's first child will be a normal son: 1/4

b. The probability that the couple's first child will be a normal daughter: 1/2

c. The probability that the couple's first child will be a color-blind son: 1/4

d. The probability that the couple's first child will be a color-blind daughter: Zero