1.A pure-breeding female fruit fly with a yellow body is crossed to a pure-breed
ID: 60525 • Letter: 1
Question
1.A pure-breeding female fruit fly with a yellow body is crossed to a pure-breeding male fruit fly with a gray body. All female offspring from the cross have gray bodies and all males have yellow bodies. Body color is likely a(n)________trait, and the gray allele is ________.
X-linked; dominant
X-linked; recessive
Autosomal; recessive
Autosomal; dominant
2. Which of the following is responsible for X-inactivation in placental mammals?
XIST
Pseudoautosomal region (PAR)
X/A ratio
Sex-lethal
3. What is the mammalian transcription factor that elicits a cascade of gene transcription and developmental events that ultimately produce male internal and external structures?
Sxl
SRY
XIST
DHT
4. What percentage of female kittens will be calico when the mother is black and father is yellow?
25%
50%
75%
100%
a.X-linked; dominant
b.X-linked; recessive
c.Autosomal; recessive
d.Autosomal; dominant
Explanation / Answer
Based on the given data,
1)
Thus, the correct option is (A) X-linked; dominant.
2)
The four different types of NTRNAs, which involved in X-inactivation, are:
Thus, the correct option is (a) XIST.
3)
The SRY is the mammalian transcription factor that elicits a cascade of gene transcription and developmental events that ultimately produce male internal and external structures. Thus, the correct option is (b).
4)
Thus, the correct option is (b) 50%.
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