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[Arabidopsis] Help for verifying some genetics questions

Kop Owen via arab-gen%40net.bio.net (by kopkop9 from gmail.com)
Sun Dec 8 15:53:31 EST 2013


Dear all,
Would you please help to verify some genetics questions?
Thanks a lot!
Kop


1.

In a dihybrid cross AAbb × aaBB, what proportion of homozygotes is expected
among the F2 offspring?

    A.

1/4



B.

1/2



C.

3/4



D.

All are homozygotes.



E.

None are homozygotes.



2.

In a dihybrid cross AABB × aabb, what proportion of heterozygotes for both
gene pairs is expected among the F2 offspring?

    A.

1/4



B.

1/2



C.

3/4



D.

All are heterozygotes.



E.

None are heterozygotes.



3.

In the dihybrid cross AaBb × aabb, what proportion of homozygotes is
expected among the F1 offspring?


A.

1/4



B.

1/2



C.

3/4



D.

All are homozygotes.



E.

None are homozygotes.



4.

Among the dihybrid crosses below, which will produce a 1:1 phenotypic
ratio?


A.

AABB × aabb



B.

AaBb × AaBb



C.

AaBb × aabb



D.

AaBB × aaBB



E.

AAbb × aaBB



5.

Among the dihybrid crosses below, which will give a 1:1:1:1 ratio?


A.

AABB × aabb



B.

AaBb × AaBb



C.

AaBb × aabb



D.

AaBB × aaBB



E.

AAbb × aaBB


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