Question

EXPLAIN SHOW WORK PLEASE.

A recessive allele (d) of the dancer gene in mice affects the inner ear and results in mice with balance problems and an unusual gait. You learned in class that the A gene, which is on a different chromosome, has an allele, A^Y,that is dominant for yellow coat color and recessive lethal. You cross a pure-breeding line of dancer mice that have normal coats to a strain with normal gait and yellow coats. In the resulting F1 progeny, 1/2 have yellow coats and normal gaits and 1/2 have normal coats and normal gaits
What are the possible genotypes of the yellow-coated F1 progeny? Pick all that apply:

Select one or more:

a. ddAA

b. DdAA^Y

c. DD AA^Y

d. DdA^YA^Y

e. ddA^YA^Y

f. DDAA

g. DdAA

If you cross the yellow-coated F1 brothers and sisters, in the next generationwhat proportion of the progeny will have the dancer gait and yellow coats?

Select one:

a. 1/6

b. 1/16

c. 0

d. 9/16

e. 2/3

f. 1/12

g. 1/4

h. 3/16

i. 100%

j. 3/4

Answer 1

recessive allele (d) of the dancer gene in mice affects the inner ear and results in mice with balance problems and an unusual gait. You learned in class that the A gene, which is on a different chromosome, has an allele, A^Y,that is dominant for yellow coat color and recessive lethal.

You cross a pure-breeding line of dancer mice that have normal coats to a strain with normal gait and yellow coats.

In the resulting F1 progeny, 1/2 have yellow coats and normal gaits and 1/2 have normal coats and normal gaits

Normal ALLELE----dominant -------D

A recessive allele -------d

========================================

A^Y,that is dominant for yellow coat color an

recessive lethal----------- A^Y

LETHAL RECESSIVE -------A^YA^Y

^{YELLOW MICE –HETEROZYGOSU ----------}A^Y A

^{=======================================}

pure-breeding line of dancer mice that have normal coats

genotype =dd AA

====================

strain with normal gait and yellow coats.

genotype =DD A^YA

CROSS    BETWEEN dd AA    X        DD A^YA

Gametes --------------- (dA)               X (D A^Y) (D A)

	D AY	D A
(dA)	D AYdA	D A dA

What are the possible genotypes of the yellow-coated F1 progeny? Pick all that apply:

Select one or more:

a. ddAA

b. DdAA^Y -------------------answer

c. DD AA^Y

d. DdA^YA^Y

e. ddA^YA^Y

f. DDAA

g. DdAA-------------------answer

If you cross the yellow-coated F1 brothers and sisters, in the next generation what proportion of the progeny will have the dancer gait and yellow coats?

Select one:

a. 1/6

b. 1/16------answer

c. 0

d. 9/16

e. 2/3

f. 1/12

g. 1/4

h. 3/16

i. 100%

j. 3/4

yellow-coated F1 x        yellow-coated F1

D A^YdA        x      D A^YdA            

Gamete A^Yd--------------1/4

Gamete dA-------------1/4

the dancer gait and yellow coats?

Answer

=1/4 x1/4 =1/16