Answer to Question #308242 in Genetics for Mark

Question

4. In Jimsonweed, purple flower color (P) is dominant over white (p) and spiny pods (S) over smooth pods (s). These pairs of alleles are not linked. A Jimsonweed of genotype PPss is crossed with one of ppss. What is the genotype of the F1 generation? The phenotype?

5. In peas, the gene for tall plants (T) is dominant over the gene for dwarf plants (t) and round seed (R) is dominant over wrinkled seed (r). If one crosses a homozygous tall, wrinkled-seeded plant with a homozygous dwarf, round-seeded plant, what is the phenotype of the F1? The genotype of the F1? The phenotypic ratio of the F2?

6. If the cross BbDD X bbDd is made, which of the following would not be represented in the offspring?

a. BbDD; b. BbDd; c. bbDD; d. bbDd; e. BBDd

Answer 1

question 4. The cross is PPss x ppss

the possible gametes for PPss is Ps, and for ppss is ps

the possible F1 genotype is Ppss (purple-smooth)

Question 5. the crosses are either

TTrr x ttRR or TTrr x ttRr

the gametes are Tr and tR

the F1 genotype is TtRr (Tall-round)

Question 6. the answer is e. BBDd