Heredity Genetics

In peas, a pure tall (TT) is crossed with a pure short plant(tt). The ratio of pure tall plants to pure short plants in F2 generation is

• 1:3

• 3:1

• 1:1

• 2:1

Assuming tallness is dominant, what would the genotype look like for a man who is heterozygous tall?

• TT

• tt

• Tt

• option a & c

A cross between a tall plant (TT) and short plant (tt) resulted in progeny that were all tall plants. why?

• Tallness is the dominant trait

• Shortness is the dominant trait

• Tallness is the recessive trait

• Height of plant is not governed by gene t or T

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Recessive alleles are expressed only in ________ form. (homozygous/heterozygous)

A Pea plant bearing yellow seeds (YY) is crossed with a pea plant bearing green seeds (yy). What would be the genotypic ratio of yellow seeds versus green seeds in the F2 generation?

• 1:1

• 1:3:1

• 1:2:1

• 3:!