Question

In pea plants, round seeds (R) are dominant over wrinkled seeds (r) and tall plants (T) are dominant over short plants (t). Report the genotypes and phenotypes if you cross a homozygous round seed, heterozygous tall plant with a wrinkled seed, homozygous tall plant, what are the expected genotypes and phenotypes?

Answer 1

• Progeny genotype: 8/16 = 1/2 RrTT--> 50% of the progeny will be heterozygous rounded seed and homozygous tall plant

8/16 = 1/2 RrTt--> 50% of the progeny will be

heterozygous rounded seed and heterozygous tall plant

• Progeny Phenotype: 100% rounded seeds and tall plants, RrT-

Step-by-step explanation:

Available data:

• Round seeds (R) are dominant over wrinkled seeds (r)

• Tall plants (T) are dominant over short plants (t).

• Cross between a homozygous round seed (RR), heterozygous tall plant (Tt) with a wrinkled seed (rr), homozygous tall plant (TT).

What are the expected genotypes and phenotypes?

Parental) RRTt x rrTT

Gametes) RT RT Rt Rt

rT rT rT rT

Punnet Square) RT RT Rt Rt

rT RrTT RrTT RrTt RrTt

rT RrTT RrTT RrTt RrTt

rT RrTT RrTT RrTt RrTt

rT RrTT RrTT RrTt RrTt

F1) Progeny genotype: 8/16 = 1/2 RrTT--> 50% of the progeny will be heterozygous rounded seed and homozygous tall plant

8/16 = 1/2 RrTt--> 50% of the progeny will be heterozygous rounded seed and heterozygous tall plant

Progeny Phenotype: 100% rounded seeds and tall plants, RrT-

Answer 2

Expected genotypes = 50% RrTT and 50% RrTt

Expected phenotypes = All round seeds, tall plants.

Step-by-step explanation:

Round seeds (R) are dominant over wrinkled seeds (r).

Tall plants (T) are dominant over short plants (t).

Homozygous round seed, heterozygous tall plant = RRTt

Wrinkled seed, homozygous tall plant = rrTT

RRTt x rrTT

Progeny:

8 RrTT - round seed, tall plants

8 RrTt - round seed, tall plants

Expected genotypes = 8 RrTT and 8 RrTt

Expected phenotype = round seeds, tall plants.

See the attached image for the Punnet's square result.