Eyeless is a recessive gene (ey) on the fourth chromosome of Drosophila. A male trisomic for...
Eyeless is a recessive gene (ey) on the fourth chromosome of Drosophila. A male trisomic for chromosome 4 with the genotype +eyey is crossed to a disomic eyeless female of the genotype +ey. What is the phenotypic ratio expected among the progeny?
a. 3 wildtype : 1 eyeless
b. 4 wildtype : 1 eyeless
c. 5 wildtype : 1 eyeless
d. 1 wildtype : 1 eyeless
e. 2 wildtype : 1 eyeless
Homework Answers
A option
Male geneotype +eyey (trisomic) and female +ey (heterogygous)
+eyey X +ey
I
+ eyey or +ey ey + ey (femalegamete formation)
(Male gamete formation)
I
After crossing
++ +eyey. +ey. eyeyey (3 wildtype:1 eyeless)
Or
++ey. +ey. +eyey. eyey (3 wildtype:1eyeless)
So A option correct
Add Answer to:
Eyeless is a recessive gene (ey) on the fourth chromosome of
Drosophila. A male trisomic for...
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The eyeless trait is recessive in Drosophila. One of the offspring of a cross between heterozygote (Ee) parents has eyes. How would you determine whether this fly is homozygous (EE) or heterozygous (Ee)? Cross it with a fly that has eyes but an unknown genotype Cross it with a heterozygous fly Cross it with an eyeless fly Cross it with a fly that has eyes and an EE genotype Question 23 3 pts A...
I know drosophila only has recombination among females. So since 20 map units=20% recombination, I HAVE...
I know drosophila only has recombination among females. So since
20 map units=20% recombination,
I HAVE THE ANSWERS! I need help understanding
why the answers are what they are. PLEASE don't just copy
the answers I will write down
a) 1/2
b) (.1)/(.4)(.1) = 20%
c) 2:1
d)
1/3 w female
1/3 w+ female
1/15 w male
4/15 w+ male
I NEED AN EXPLANATION OF THE ANSWERS. NOT THE ANSWERS
THEMSELVES. THANK YOU IN ADVANCE.
12. A Drosophila female is...
In Drosophila, the autosomal recessive brown eye color mutation (b) displays interactions with both the X-linked...
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(b) displays interactions with both the X-linked recessive
vermilion mutation (v) and the autosomal recessive scarlet (s)
mutation. Flies homozygous for brown and simultaneously hemizygous
or homozygous for vermilion have white eyes. Flies simultaneously
homozygous for both the brown and scarlet mutations also have white
eyes. Flies that are wildtype at all 3 loci have wildtype eye
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mutant at only one...
6. The white gene in Drosophila is on the X chromosome and wº (red) is dominant over w (white). A red-eyed female is crossed with a white-eyed male. (A) What must the genotype of the male be? (B) What must the genotype of the female be if the progeny are 25% red male, 25% red female, 25% white male, 25% white female?
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Explain Both and Answer Thank You
The eyeless trait is recessive in Drosophila. One of the offspring of a cross between heterozygote (Ee) parents has eyes. How would you determine whether this fly is homozygous (EE) or heterozygous (Ee)? Cross it with a fly that has eyes but an unknown genotype Cross it with a heterozygous fly Cross it with an eyeless fly Cross it with a fly that has eyes and an EE genotype Question 23 3 pts A...
I know drosophila only has recombination among females. So since
20 map units=20% recombination,
I HAVE THE ANSWERS! I need help understanding
why the answers are what they are. PLEASE don't just copy
the answers I will write down
a) 1/2
b) (.1)/(.4)(.1) = 20%
c) 2:1
d)
1/3 w female
1/3 w+ female
1/15 w male
4/15 w+ male
I NEED AN EXPLANATION OF THE ANSWERS. NOT THE ANSWERS
THEMSELVES. THANK YOU IN ADVANCE.
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