A tall, purple-flowered pea plant (TtPp) is allowed to self- d pollinate. (The r

Question

A tall, purple-flowered pea plant (TtPp) is allowed to self- d pollinate. (The recessive alleles code for short plants and white flowers.) The phenotypic ratio of the resulting offspring is 9:3:3:1. What is the genotype of the plant whose phenotype appeared once out of every 16 offspring (the 1* in the 9:3:3:1 ratio)? 50 Answer: ttpp A woman homozygous for polydactyly (extra fingers and d toes), a dominant trait, is married to a man with 5 fingers and toes. 0 Enter in the textbox below, the percentage (between 0 100) of the offspring of this couple that would be expected to be polydactytl. Answer: Andalusian chickens exhibit three colors; black, white, and blue. The gene controlling color has two alleles. When a true- breeding black Andalusion chicken is crossed with a true- breeding white Andalusion chicken, all offspring are blue. 50 What is the relationship between the two alleles incomplete dominance

Explanation / Answer

1) Tall plant - TT.

Dwarf plant - tt.

Purple flower - PP.

White flower - pp.

Tall and purple flower pea plant - TtPp.

Dwarf and white flower pea plant - ttpp.

Self crossed TtPp X TtPp.

Gametes formed TP, tP,Tp and tp    TP, tP,Tp and tp.

Next generation

The genotype of dwarf and white flower pea plant - ttpp.

2) Polydactyly (extra fingers and or toes) is a dominant trait.

The genotype of homozygous Polydactyly woman - PP.

The genotype of man - pp.

Cross between them PP X pp

Gametes formed P p.

Next generation Pp(Polydactyly offspring).

Then, the % of offspring of this couple that would be expected to be polydactytl - 100%.

Male/Female TP tP Tp tp TP TTPP( Tall and purple flower pea plant) TtPP( Tall and purple flower pea plant) TTPp( Tall and purple flower pea plant) TtPp( Tall and purple flower pea plant) tP TtPP( Tall and purple flower pea plant) ttPP( Dwarf and purple flower pea plant) TtPp( Tall and purple flower pea plant) ttPp( Dwarf and purple flower pea plant) Tp TTPp( Tall and purple flower pea plant) TtPp( Tall and purple flower pea plant) TTpp( Tall and white flower pea plant) Ttpp( Tall and white flower pea plant) tp TtPp( Tall and purple flower pea plant) ttPp( Dwarf and purple flower pea plant) Ttpp( Tall and white flower pea plant) ttpp( Dwarf and white flower pea plant)

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