Chickens that carry both the alleles for rose comb (R) and pea comb (P) have walnut combs, whereas chickens that lack both of these alleles (that is, rr pp) have single combs. From the information about interactions between these two genes, determine the phenotypes and proportions expected from the following crosses:

a. RR Pp × rr Pp;
b. rr PP × Rr Pp;
c. Rr Pp × Rr pp;
d. Rr pp × rr pp

Question

30-03-2021
Biology

contestada

Chickens that carry both the alleles for rose comb (R) and pea comb (P) have walnut combs, whereas chickens that lack both of these alleles (that is, rr pp) have single combs. From the information about interactions between these two genes, determine the phenotypes and proportions expected from the following crosses:

a. RR Pp × rr Pp;
b. rr PP × Rr Pp;
c. Rr Pp × Rr pp;
d. Rr pp × rr pp

Respuesta :

Otras preguntas

A lens is designed to work in the visible, near-infrared, and near-ultraviolet. The best resolution of this lens from a diffraction standpoint is A) The same fo

In a study, subjects are randomly assigned to one of three groups: control, experimental A, or experimental B. After treatment, the mean scores for the three gr

Oberlin is participating in a psychology study in which he has to press a red button whenever he sees a circle on the computer screen and a green button wheneve

what does it mean when you dream about yourself dying?

Dr. Graves placed the Venn Diagram and list of numbers on the board. -0.24, 5/17, 287, 1.3, -91, -2 2/5 She asked her students to determine the label for each

iii. A sound wave can be modelled by using a slinky spring. A wavelength in this model is... a. the distance between a rarefaction and a compression. b. the len

different between of savagery

Society: This section of your presentation explores how studying technology enhances your ability to engage constructively in society. How does critically analy

Give oneexample of how bacteria maintainequilibrium in the environment.

What is the image point of (6, 7) after a translation left 5 units and up 3 units? Submit Answer attempt 1 out of 3

ACCESS MORE

marianaegarciaperedo marianaegarciaperedo · Answer 1 · 2021-04-01T06:17:38+02:00

Answer:

Explanation:

Available data:

There are two diallelic genes that code for chickens comb
Dominant alleles R and P express rose comb and pea comb, respectively
When they are together in a genotype, they express walnut combs, R-P-
Recessive alleles are r and p
Genotypes with only recessive alleles express single combs, rrpp

So, genotypes and phenotypes would be like

Walnut combs, RRPP, RrPP, RRPp, RrPp (One dominant allele of each gene)
Rose comb, RRpp or Rrpp (only R gene with dominant allele)
Pea comb, rrPP or rrPp (Only P gene with dominant allele)
Single combs, rrpp (no dominant alleles at all)

a) Cross: RR Pp × rr Pp

Phenotypes: Walnut x Pea

Gametes) RP, Rp, RP, Rp

rP, rp, rP, rp

Punnett square) RP RP Rp Rp

rP RrPP RrPP RrPp RrPp

rp RrPp RrPp Rrpp Rrpp

F1) 12/16 = 3/4 R-P-, Walnut-combed animals

4/16 = 1/4 Rrpp, Rose-combed animals

b. Cross: rr PP × Rr Pp

Phenotype: Pea x Walnut

Gametes: rP, rP, rP, rP

RP, Rp, rP, rp

Punnett square) RP rP Rp rp

rP RrPP rrPP RrPp rrPp

F1) 4/16 = 1/4 = 25% RrPP, Walnut-combed animals

4/16 = 1/4 = 25% rrPP, Pea-combed animals

4/16 = 1/4 = 25% RrPp, Walnut-combed animals

4/16 = 1/4 = 25% rrPp, Pea-combed animals

1/2 = 50% Walnut-combed animals, R-P-

1/2 = 50% Pea-combed animals, rrP-

c. Cross: Rr Pp × Rr pp

Phenotype: Walnut x Rose

Gametes: RP, Rp, rP, rp

Rp, rp, Rp, rp

Punnett square) RP Rp rP rp

Rp RRPp RRpp RrPp Rrpp

rp RrPp Rrpp rrPp rrpp

F1) 2/16 = 1/8 RRPp, walnut

2/16 = 1/8 RRpp, Rose

4/16 = 2/8 RrPp, Walnut

4/16 = 2/8 Rrpp, Rose

2/16 = 1/8 rrPp, Pea

2/16 = 1/8 rrpp, single

6/16 = 3/8 walnut, R-P-

6/16 = 3/8 rose, R-pp

2/16 = 1/8 Pea, rrP-

2/16 = 1/8 Single, rrpp

d. Cross: Rr pp × rr pp

Phenotype: Rose x Single

Gametes) Rp, rp, Rp, rp

rp, rp, rp, rp

Punnett square) Rp Rp rp rp

rp Rrpp Rrpp rrpp rrpp

F1) 8/16 = 1/2 = 50% Rrpp, Rose-combed animals

8/16 = 1/2 = 50% rrpp, single-combed animals