Question

1. (2 pts) In pea plants, round (R) seeds are dominant to wrinkled (r) seeds. a. In a parental cross, purebred round-seed (RR) plants are bred to purebred wrinkled-seed plants. Draw a Punnett square for this cross and tell the genotypic and phenotypic ratios of the offspring. b. The resulting F1 plants are crossed to one another (intercross). Draw a Punnett square and tell the genotypic and phenotypic ratios of the F2 offspring. c. What are the genotypic and phenotypic ratios that result from a cross of a homozygous round (RR) to a heterozygous round (Rr) plant? d. You have a round-seed plant but you don't know its genotype. It could be RR or Rr. To figure out its genotype, you do a test cross, i.e. cross to a plant of known genotype. Since wrinkled is recessive, you always know the genotype of wrinkled-seed plants (rr). Tell the possible phenotypic ratios of the offspring from the test cross and their interpretation (genotype of the unknown).

          1. (2 pts) In pea plants, round (R) seeds are dominant to wrinkled (r) seeds.
a. In a parental cross, purebred round-seed (RR) plants are bred to purebred
wrinkled-seed plants. Draw a Punnett square for this cross and tell the genotypic and
phenotypic ratios of the offspring.
b. The resulting F1 plants are crossed to one another (intercross). Draw a Punnett square
and tell the genotypic and phenotypic ratios of the F2 offspring.
c. What are the genotypic and phenotypic ratios that result from a cross of a
homozygous round (RR) to a heterozygous round (Rr) plant?
d. You have a round-seed plant but you don't know its genotype. It could be RR or Rr. To
figure out its genotype, you do a test cross, i.e. cross to a plant of known genotype.
Since wrinkled is recessive, you always know the genotype of wrinkled-seed plants
(rr). Tell the possible phenotypic ratios of the offspring from the test cross and their
interpretation (genotype of the unknown).

1. (2 pts) In pea plants, round (R) seeds are dominant to wrinkled (r) seeds.
a. In a parental cross, purebred round-seed (RR) plants are bred to purebred
wrinkled-seed plants. Draw a Punnett square for this cross and tell the genotypic and
phenotypic ratios of the offspring.
b. The resulting F1 plants are crossed to one another (intercross). Draw a Punnett square
and tell the genotypic and phenotypic ratios of the F2 offspring.
c. What are the genotypic and phenotypic ratios that result from a cross of a
homozygous round (RR) to a heterozygous round (Rr) plant?
d. You have a round-seed plant but you don't know its genotype. It could be RR or Rr. To
figure out its genotype, you do a test cross, i.e. cross to a plant of known genotype.
Since wrinkled is recessive, you always know the genotype of wrinkled-seed plants
(rr). Tell the possible phenotypic ratios of the offspring from the test cross and their
interpretation (genotype of the unknown).

Added by Rebecca S.

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