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