Punnett square( genetics pratice questions) ======2 questions?

Question

1. In pea plants, tall (T) is dominant to dwarf(t). Show the cross between a heterozygous tall and a dwarf plant.

2. If 2 constricted pod plants are crossed what are the expected phenotypes of the offspring and in what proportion?

plz!!!!!!!!!!! anwer!!!!: (

Answer 1

Heterozygous tall = Tt x
Dwarf = tt
T t
t t
=
Tt, Tt, tt, tt

2 constricted cross = tt x tt
the expected phenotype = tt in a 100% proportion ; for every offspring they will be tt if both parents are tt; i think 4:4 is the proportion

Answer 2

These are simple, straightforward questions if you know the terminology.

Do you understand that heterozygous means that the letters in the genotype don't match? (homozygous is tt or TT, heterozygous is Tt)

1. Parents Tt x tt
Gametes T t t t

Put these on the Punnett square and find the results.

2. Constricted pods are the recessive form of the trait. If we use uppercase P and lowercase p for this trait, two constricted pea plants are pp and pp. All the offspring are pp because that's the only form of the gene that is available.

Answer 3

1.Tt x tt = Tt, Tt, tt, tt
2. 1/4 TT, 1/2 Tt, 1/4 tt