Consider a diploid organism that has three pairs of autosomes. Assume that the o

Question

Consider a diploid organism that has three pairs of autosomes. Assume that the organism receives autosomes A, B, and C from the female parent and A’, B’, and C’ from the male parent. Assume no crossing-over occurs.

What proportion of the gametes would be expected to contain all of the chromosomes of maternal origin?

What proportion of the gametes would be expected to contain all of the chromosomes of paternal origin?

What proportion of the gametes would be expected to contain chromosomes of both maternal and paternal origin.

Explanation / Answer

1. The chance to inherit autosomes of maternal origin = 1/2.

Thus, the proportion of the gametes would be expected to contain all of the chromosomes of maternal origin

= (1/2)3 = 1/8.

2. The chance to inherit autosomes of paternal origin = 1/2.

Thus, the proportion of the gametes would be expected to contain all of the chromosomes of paternal origin

= (1/2)3 = 1/8.

3. The proportion of the gametes would be expected to contain chromosomes of both maternal and paternal origin =

1- (1/8 + 1/8) = 6/8 = 3/4.

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