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Genetics Question: A tree of genotype BBCC is crossed to a tree of genotype bbcc. The...

Genetics Question:

A tree of genotype BBCC is crossed to a tree of genotype bbcc. The resulting F1 trees are testcrossed.

A) What % of the testcross progeny will be bbcc if the 2 genes are 0 map units apart? Provide reason


B) What % of the testcross progeny will be bbcc if the 2 genes are on the wame chromosome and 60 map units apart? provide reason

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Answer #1

Answer:

A).

BC/BC x bc/bc ---Parents

BC/bc --------F1

BC/bc x bc/bc ---Testcross

If the genes are closely linked, the heterozygote produces only two types of gametes, BC & bc.

bc

BC

BC/bc

bc

bc/bc

The probability of bbcc = ½ = 50%

B). If the two genes are 60 map apart means that the two genes are not linked. Hint: If two genes are apart more than 50 map units then the two genes are said to be not linked.

bc

BC

BbCc-1/4

bc

Bbcc-1/4

Bc

Bbcc-1/4

bC

bbCc-1/4

The probability of bbcc = 1/4 = 25%

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