Rats have an XY sex determination system, like humans. You cross a female rat wi
ID: 102619 • Letter: R
Question
Rats have an XY sex determination system, like humans. You cross a female rat with pink toe pads (T) and pointy ears (Xe) to a male rat with black toe pads (t) and (XE). THe t and Xe alleles are both recessive, and the ear-shaped gene is X-linked, while the toe pad color gene is autosomal. The F1 progency all have pink toe pas.
1. What are the genotypes of the parental generation?
2.What are the genotypes of the F1 porgeny?
3. If the F1 are crossed to produce F2 progent, what proportion of the F2progency will be black padded, pointy-eared males? Show all work in detail.
Explanation / Answer
Answer:
Based on the given information:
The cross can be represented as:
T/T;Xe/Xe x t/t;XE/Y
1) What are the genotypes of the parental generation?
2) What are the genotypes of the F1 porgeny?
3) If the F1 are crossed to produce F2 progent, what proportion of the F2 progency will be black padded, pointy-eared males? Show all work in detail.
Black padded, pointy eared males will be ttXeY (indicated in bold above). This represents 1/16 of the total progeny. Therefore 1/16th of the F2 generation progeny will be black padded with pointy eared males.
TXe TY tXe tY TXe TtXeXe TTXeY TtXeXe TtXeY tXE TtXEXe TtXEY ttXEXe ttXEY tXe TtXeXe TtXeY ttXeXe ttXeY tXE TtXEXe TtXeY ttXEXe ttXEYRelated Questions
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