Problem 214 An experienced goldfish breeder receives two unu

Problem 2.14 An experienced goldfish breeder receives two unusual male goldfish. One is black rather than gold, and the other has a single tail fin rather than a split tail fin. The breeder crosses the black male to a female that is gold. All the Fi are gold. She also crosses the single-finned male to a female with a split tail fin. All the Fi have a split tail fin. She then crosses the black male to Fi gold females and, separately, crosses the single-finned male to F1 split-finned females. The results of the crosses are shown below. Black male 32 F1 gold female: Gold x Black 34 Single-finned male x F1 split-finned female Split fin 41 Single fin 39 Part A What do the results of these crosses suggest about the inheritance of color and tail fin shape in goldfish? O The inheritance of color and fin shape are due to segregation of two alleles at the same gene. O The inheritance of color and fin shape are each due to segregation of two alleles at a single gene. O The inheritance of color is due to segregation of two alleles at different genes; the same is true for fin shape. Submit My Answers Give up

Solution

Answer:

A). The inheritance of color and fin shaped are each due to segregation of two alleles at a single gene

Color gene consists of two allele of a gene = Aa

Fin shape gene also consists of two allele of different gene = Bb

D). 0.06

Phenotype

Observed(O)

Expected (E)

O-E

(O-E)2

(O-E)2/E

gold

32

33

-1

1.00

0.03

black

34

33

1

1.00

0.03

66

66

0.06

E). 0.05

Phenotype

Observed(O)

Expected (E)

O-E

(O-E)2

(O-E)2/E

gold

41

40

1

1.00

0.03

black

39

40

-1

1.00

0.03

80

80

0.05

Phenotype	Observed(O)	Expected (E)	O-E	(O-E)2	(O-E)2/E
gold	32	33	-1	1.00	0.03
black	34	33	1	1.00	0.03
	66	66			0.06