Question

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6. Tall tomato plants are produced by the dominant allele, D, and dwarf plants by its...

6. Tall tomato plants are produced by the dominant allele, D, and dwarf plants by its recessive allele, d. Hairy stems are produced by a dominant allele, H, and hairless stems by its recessive allele, h. A dihybrid tall, hairy plant is test crossed. The following F1 offspring were produced: 118 tall, hairy plants 121 dwarf, hairless plants 112 tall hairless plants 109 dwarf, hairy plants

a. What are the genotypes of the parents?

b. Diagram this cross using a Punnett square.

c. What are the genotypes of the F1 generation?

d. What is the ratio of tall to dwarf?

e. What is the ratio of hairy to hairless?

Expert Solution

Answer-

According to the given question-

Here we have a tomato plant with two characteristics, one is the length of the stem another is the presence or absence of hair on the stem.

the allele for the tall plant = D, Allele for dwarf plant = d.

The tall plant is dominant over the dwarf plant.

the allele for Hairy stems = H, while the allele for hairless stems = h

Hairy stems are dominant over the hairless stem.

When we make a cross between the plant which are dihybrid tall and hairy plant with the true-breeding dwarf plant with hairless stem then we get the following offspring-

The genotype of dihybrid Tall plant with hairy stem = DdHh

The genotype of the true breeding dwarf plant with hairless stem - ddhh

Cross between DdHh ddhh

	dh	dh	dh	dh
DH	DdHh (Tall Plant with hairy stem)	DdHh (Tall Plant with hairy stem)	DdHh (Tall Plant with hairy stem)	DdHh (Tall Plant with hairy stem)
Dh	Ddhh (Tall plant with hairless stem)	Ddhh (Tall plant with hairless stem)	Ddhh (Tall plant with hairless stem)	Ddhh (Tall plant with hairless stem)
dH	ddHh (Dwarf plant with Hairy stem)	ddHh (Dwarf plant with Hairy stem)	ddHh (Dwarf plant with Hairy stem)	ddHh (Dwarf plant with Hairy stem)
dh	ddhh (Dwarf plant with hairless stem)	ddhh (Dwarf plant with hairless stem)	ddhh (Dwarf plant with hairless stem)	ddhh (Dwarf plant with hairless stem)

Here we get Tall Plant with hairy stem: Tall plant with hairless stem: Dwarf plant with Hairy stem: Dwarf plant with hairless stem in the ratio of 1: 1: 1: 1.

The observed number of offspring -

tall, hairy plants = 118

tall hairless plants = 112

dwarf, hairy plants = 109

dwarf, hairless plants = 121

Total number of offspring = 118 + 112 + 109 + 121 = 460

Expected number of offspring -

tall, hairy plants = 1 4 460 = 0.25 460 = 115

tall hairless plants = 1 4 460 = 0.25 460 = 115

dwarf, hairy plants = 1 4 460 = 0.25 460 = 115

dwarf, hairless plants = 1 4 460 = 0.25 460 = 115

a. genotypes of the parents = DdHh and ddhh

c. genotypes of the F1 generation - DdHh , Ddhh , ddHh and ddhh

d. ratio of tall to dwarf- 8 tall stem plant and 8 dwarf stem plant was observed out of total 16 plants produced in F₁ generation , so the ratio of tall : dwarf = 1 : 1

e. ratio of hairy to hairless- 8 hairy stem plant and 8 hairless stem plant was observed out of total 16 plants produced in F₁ generation , so the ratio of hairy : hairless 1 : 1.

gladiator answered 2 years ago

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