Question

Punnett Square Genotypic ratio: Phenotypic ratio: 5. Purple flowers (P) are completely dominant over white flowers (p). If a pea plant is heterozygous for purple flowers, can any of this plant's offspring have all purple flowers? Think about the different genotypes with which you can cross the hetero- zygous parent: homozygous dominant, heterozygous, and homozygous recessive. Use three Punnett squares to show your work for each possible phenotype. Heterozygous purple pea plant's genotype: __ (Use this in all the crosses--this would be "Dad," and he stays the same.) Unknown plant, list the three possible genotypes: _(Use a different one for each cross; this would be "Mom," and there are three possible gentoypes.) Punnett Square Punnett Square Punnett Square Which genotype will only give you purple flowers when crossed with the heterozygote? Which genotype will give you white flowers when crossed with the heterozygote?

Punnett Square for Question #4 is a the top

Answer 1

4. Tt X Tt

Male genotype - Tt X Female genotype - Tt

Male gametes T and t and Female gametes T and t  

	T	t
T	TT	Tt
t	Tt	tt

Tall plant = TT or Tt Short plant tt Ratio 3:1

Expected genotype ratio 1:2:1 = 1 TT: 2 Tt : 1 tt

Expected phenotype ratio 3:1