Question

In: Biology

Female Tsetse flies heterozygous for 3 recessive mutations, t (tiny body), sq (squint eyes) and sb...

Female Tsetse flies heterozygous for 3 recessive mutations, t (tiny body), sq (squint eyes) and sb (soft bristles) were testcrossed to homozygous t, sq, sb/ t, sq, sb individuals and the following progeny were obtained:

Wild-type                               201                          Tiny, squint, soft bristles 234        
Soft bristles                          162                           Tiny, squint                                         204
Tiny 24                           Tiny, soft bristles                               1041
Squint 1104                        Squint, soft bristles         30
A)
If the 3 genes are on the same chromosome, determine the map distance separating the 2 genes t and sb?

a) 1.4 centiMorgans.

b) 1.63 centiMorgans.

c) 14 centiMorgans.

d) 16.3 centiMorgans.

e) 30.3 centiMorgans.

B)
the 3 genes are on the same chromosome, determine the map distance between the 2 genes t and sq?

a) 1.4 centiMorgans.

b) 1.63 centiMorgans.

c) 14 centiMorgans.

d) 16.3 centiMorgans.

e) 30.3 centiMorgans.

C)
If the 3 genes are on the same chromosome, determine the order of the 3 genes using the data provided?
(Hint: Remember, it is not possible to ascertain which gene comes first or last on the chromosome using ONLY the data above. Hence, there may be more than one potentially correct answer below. If so, choose EACH possible correct answer.)

a) sb, sq, t.

b) sb, t, sq.

c) t, sq, sb.

d) sq, t, sb.

e) t, sb, sq

D)
What was the genotype of the two chromosomes containing the 3 genes in the female parents?

a) t, sb, sq+/t+, sb+, sq.

b) t, sb, sq/ t+, sb+, sq+.

c) t+, sb, sq/ t, sb+, sq+.

d) t+, sq+, sb/ t, sq+, sb+.

e) You cannot tell from the data provided.

Solutions

Expert Solution

A)If the 3 genes are on the same chromosome, determine the map distance separating the 2 genes t and sb?
The answer is c) 14 centiMorgans.

B) the 3 genes are on the same chromosome, determine the map distance between the 2 genes t and sq?
The answer is e) 30.3 centiMorgans.

C) If the 3 genes are on the same chromosome, determine the order of the 3 genes using the data provided?
The answer is e) t, sb, sq

D) What was the genotype of the two chromosomes containing the 3 genes in the female parents?
The answer is a) t, sb, sq+/t+, sb+, sq.

Find the below image for calucation and explanations

The steps involved here

Step 1 : Gene order determination

Step 2: Gene distacen estimation

Step 1 : Gene order determination

gladiator answered 1 year ago
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