A sex-linked gene is traditionally... Multiple Choice A. a gene that is turned on (makes protein)...
A sex-linked gene is traditionally...
Multiple Choice
A. a gene that is turned on (makes protein) only when the female hormone estrogen is present.
B. a gene on the X chromosome that encodes traits seen only in females.
C. a gene found on any chromosome; they are X-shaped when they are metaphase chromosomes.
D. a gene that encodes traits seen only in females.
E. a gene on the X chromosome.
In fruit flies, white eyes is caused by a sex-linked recessive trait (Xw). The dominant allele is X+. Which cross would result in all red-eyed females but all white-eyed males?
Multiple Choice
A. XwXw x X+Y
B. X+X+ x X+Y
C. X+Xw x X+Y
D. X+X+ x XwY
Homework Answers
Answer : Option E
- a gene that is turned on (makes protein) only when the female hormone estrogen is present.
(This statement is false as sex linked genes can express in both males as well as females and proteins are made in both cases)
- a gene on the X chromosome that encodes traits seen only in females.
(This statement is false as it is usually the males who are affected since they carry a single copy of X chromosome which harbours the mutation)
- a gene found on any chromosome; they are X-shaped when they are metaphase chromosomes.
(There is no such definition for sex-linked genes)
- a gene that encodes traits seen only in females.
(This statement is false as sex linked genes are not restricted only to females)
- a gene on the X chromosome
(This statement can be deemed true as most sex linked genes are referred to be present on X chromosome. This is because the X chromosome has many genes as compared to the small Y chromosome)
Answer : Option A
|
Xw |
Xw |
|
|
X+ |
XwX+ (Red eyed female) |
XwX+ (Red eyed female) |
|
Y |
XwY (White eyed male) |
XwY (White eyed male) |
Add Answer to:
A sex-linked gene is traditionally...
Multiple Choice
A. a gene that is turned on (makes protein)...
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figure 4.13
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figure 4.13
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