1. Clark Kent is homozygous for both traits, “muscles of steel” and “x-ray visio
ID: 258232 • Letter: 1
Question
1. Clark Kent is homozygous for both traits, “muscles of steel” and “x-ray vision”, a trait found commonly in Kryptonites. Lois Lane is homozygous for the lack of these traits, as all humans are. Their first child together (Ralph) possesses both these traits
. a. What is his genotype?
b. Assume Ralph mates with a “normal” human female. What will their offspring be like (phenotype) in regards to these traits?
c. Now assume that Ralph has an incestuous relationship with his sister, Mimi, (a trait also commonly found on Krypton – maybe one of the reasons why the planet blew up?) which results in a child. What are the chances that this child will have both “muscles of steel” and “x-ray vision?”
2.. The gene for tall (T) is linked on the same chromosome as the gene for the color green (G). Their recessive alleles (t-short and g-yellow) are also linked together. If two organisms heterozygous for both traits are crossed the results are as follows:
252 Tall & Green
88 Short & Yellow
22 Tall & Yellow
19 Short & Green
How many maps units apart are these genes on this chromosome?
3. The following are crossover values for four genes linked on the same chromosome. Map the genes in question
C-D 18
A-B 38
A-D 8
B-C 12
D-B 30
A-C 26
4. Color blindness in humans is a sex-linked (X) recessive trait. If a colorblind male mates with a normal visioned female that carries the recessive allele, what percentage of their male offspring should be colorblind? What percentage of their female offspring will have normal vision?
Explanation / Answer
(1)
. a. What is his genotype?
muscles of steel= M
Lack of muscles of steel= m
x-ray vision=V
Lack of x-ray vision=v
Ralph’s genotype= MmVv
(he is heterozygous for both traits)
b. Assume Ralph mates with a “normal” human female. What will their offspring be like (phenotype) in regards to these traits?
Ralph (MmVv) x normal female (mmvv)
MV
Mv
mV
mv
mv
MmVv
(muscles of steel” and “x-ray vision)
Mmvv
(muscles of steel and normal vision)
mmVv
(Normal muscles and “x-ray vision”)
Mmvv
(Normal muscles and normal vision)
c. Now assume that Ralph has an incestuous relationship with his sister, Mimi, (a trait also commonly found on Krypton – maybe one of the reasons why the planet blew up?) which results in a child. What are the chances that this child will have both “muscles of steel” and “x-ray vision?”
Ralph (MmVv) x Mimi (MmVv)
Children=
9 muscles of steel” and “x-ray vision
3 muscles of steel and normal vision
3 Normal muscles and “x-ray vision”
1 Normal muscles and normal vision
chances that this child will have both “muscles of steel” and “x-ray vision is 9/16
MV
Mv
mV
mv
mv
MmVv
(muscles of steel” and “x-ray vision)
Mmvv
(muscles of steel and normal vision)
mmVv
(Normal muscles and “x-ray vision”)
Mmvv
(Normal muscles and normal vision)
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