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In pea plants, the appearance of flowers along the main stem isa dominant phenotype called "axial" and is controlled by an alleleT. The recessive phenotype, produced by an allele t, hasflowers only at the end of the stem and is called "terminal."

Pod form displays a dominant phenotype "inflated," controlled byan allele C, and a recessive "constricted" form, producedby the c allele.

A cross is made between a pure-breeding axial, constricted plantand a plant that is pure-breeding terminal, inflated.

Part A

The F1 progeny of this cross are allowed to self-fertilize. Whatis the expected phenotypic distribution among the F2 progeny?

*The answer for this one is 9:3:3:1. I understand this part.

Part B

Suppose that all of the F2 progeny with terminal flowers, i.e.,plants with terminal flowers and inflated pods and plants withterminal flowers and constricted pods, are saved and allowed toself-fertilize to produce a partial F3 generation. What is theexpected phenotypic distribution among these F3 plants?

(Remember to take into consideration the frequency of eachgenotype in the F2 as well as the probability of specific offspringthat result from self-fertilizing each F2 genotype.)

*I don't understand this part. It wants wants an answer in termsof "terminal inflated : terminal constricted."

Part C

If an F1 plant from the initial cross described above is crossedwith a plant that is terminal, constricted, what is the expecteddistribution among the resulting progeny?

*I understand this part. The answer is axial inflated : axialconstricted : terminal inflated : terminal constricted =1:1:1:1

Part D

If the plants with terminal flowers produced by the cross inPart C are saved and allowed to self-fertilize, what is theexpected phenotypic distribution among the progeny?

*I also don't understand this part. They want an answer in termsof "terminal inflated : terminal constricted."

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Hubert Koch
Hubert KochLv2
30 Sep 2019

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Related questions

In chickens, the presence of feathers on the legs is due to a dominant allele (F), and the absence of leg feathers is due to a recessive allele (f). The comb on the top of the head can be either pea-shaped, a phenotype that is controlled by a dominant allele (P), or a single comb controlled by a recessive allele (p). The two genes assort independently.

Assume that a pure-breeding rooster that has feathered legs and a single comb is crossed with a pure-breeding hen that has no leg feathers and a pea-shaped comb. The F1 are crossed to produce the F2. Among the resulting F2, however, only birds with a single comb and feathered legs are allowed to mate. These chickens mate at random to produce F3 progeny.

What is the expected phenotype ratio for the resulting F3 progeny? Express your answer as two numbers separated by colon.

feathered legs and single comb : no leg feathers and single comb =

1. a). The position of the flower on the stem of the garden pea is governed by a pair of alleles. Flowers growing in the axis (upper angle between petiole and stem) are produces by the action of a dominant allele 'T', those growing only at the tip of the stem by its recessive allele 't'. Colored flowers are produced by a dominant gene 'C', and white flowers by its recessive allele 'c'. A dihybrid plant with colored flowers in the leaf axis is crossed to a pure strain of the same phenotype. What genotypic and phenotypic ratios are expected in the F1 progeny?

b). In summer squash, white fruit color is governed by a dominant allele (W) and yellow fruit color by the recessive (w). A dominant allele at another locus (S) produces disc-shaped fruit and its recessive allele (s) yields sphere-shaped fruit. If a homozygous white disc variety of genotype 'WWSS' is crossed with a homozygous yellow sphere variety (wwss), the F1 are all white disc dihybrids of genotype 'WwSs'. If the F1 is allowed to mate at random, what would be the phenotypic ratio expected in the F2 generation?

Hi, Can you please explain clearly. Thank you.

Hi I am studying for a biology exam and I have some questionsthat are on a review sheet that i am unsure about


1. In Tomatoes, the allele for red fruit is dominant over theallele for yellow fruit. If a plant that is homozygous for redfruit is crossed with a plant with yellow fruit –

a) what is/are the genotype(s) and the phenotype(s) of the fruitproduced in the F1 generation?

b) what is/are the genotype(s) and the phenotype(s) of the fruitproduced in the F2 generation?

c) what is the phenotypic ratio of the F2 fruit?


2. A plant with red flowers is crossed with a plant with whiteflowers. All the F1 plants produced red flowers. When the F1 plantsare allowed to self-pollinate, they produce 623 plants with redflowers and 198 plants with white flowers. What are the genotypesof the P and F1 generations?

3. In Tomatoes, the allele for red fruit isdominant over the allele for yellow fruit. Theallele for tall plants is dominant of the allele forshort plants. Find the genotypes and phenotypes ofthe F1 and F2 generations and the phenotypicratio of a cross between a homozygous dominant in both genes and ahomozygous recessive in both genes. The homozygous individuals arethe Parental generation.

4. In cocker spaniels, solid coat color is dominantover spotted coat. A veterinarian has a spaniel with a solidcoat. How can she unequivocally determine the genotype of thisanimal for coat color from a single breeding?

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