1. i) Genes A and B assort independently of one another. For an individual with
ID: 58882 • Letter: 1
Question
1.
i) Genes A and B assort independently of one another. For an individual with the genotype AaBb, what proportion of their gametes will be AB?
a) 1
b) 0.75
c) 0.5
d) 0.25
ii) Genes A and B are linked and 20 mu apart. For an individual with the genotype AB/ab, what proportion of their gametes will be AB?
a) 0.80
b) 0.4
c) 0.2
d) 0.1
e) 0.05
iii) Genes A and B are linked and 20 mu apart. For an individual with the genotype Ab/aB, what proportion of their gametes will be AB?
a) 0.8
b) 0.4
c) 0.2
d) 0.1
e) 0.05
2.
a) A cross between AB/AB and ab/ab was performed to produce progeny that are now AB/ab. These AB/ab progeny were then crossed back to the homozygous mutant parent ab/ab to produce the following progeny:
A_B_ 400
aabb 405
A_bb 100
aaB_ 95
What is the approximate map distance in map units between genes A and B?
a) 0.2 mu
b) 20 mu
c) 0.5 mu
d) 50 mu
e) 0.8 mu
f) 80 mu
b) A three point cross is made between AbC/aBc and abc/abc. If gene "C" is in the middle, then which of the following genotypes would represent one of the double cross-over progeny?
a) ABC
b) ABc
c) Abc
d) abC
e) more than one of the above
c) A three point cross is made between AbC/aBc and abc/abc. If gene "C" is in the middle, then which of the following genotypes would represent one of the progeny produced when a single cross-over between genes A and C occurs?
a) ABC
b) ABc
c) Abc
d) abC
e) more than one of the above
a) 0.8
b) 0.4
c) 0.2
d) 0.1
e) 0.05
Explanation / Answer
1. i. 0.25
ii. 0.4
iii. 0.1
2.a. 20 mu
2. b. ABC
2. c. ABc
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