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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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Julaaro Julaaro
wrote...
11 years ago
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.

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

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

c)What proportion of the gametes would be expected to contain chromosomes of both maternal paternal origin.
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wrote...
#1
11 years ago
Well first of all the total number of possible different gametes would be 2^n (where n= the number of homologous pairs of chromosomes, so n = 3), 2^3 is 8. So there are 8 possible combinations.

The chances of getting only maternal chromosomes would be (1/2)^n = 1/8.

The chances of getting only paternal chromosomes would also be (1/2)^n = 1/8.

So the chances of having a mixture would be 1-(2/8) = 6/8
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