Question

 A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic makeup of the tall parent can be depicted as *


a) TTWW

b) TTww

c) TtWW

d) TtWw

​

Answer 1

Answer:

d)TtWw

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Answer 2

Explanation:

According to the law of dominance, a dihybrid cross between two pure-breeding varieties yields uniforms F

1

generation of all dominant offspring. Since here F

1

generation consists of short plants with violet flowers and tall plants with violet flowers in a 1:1 ratio; the dominant parent is not purebred. The absence of a dominant allele for flower color (violet) would make the phenotype of dominant parent tall with white flowers. The appearance of the recessive trait in F

1

generation (dwarfism) confirms the presence of one recessive allele in the dominant parent and makes it heterozygous for plant height (Tt). Since all F

1

generation has a violet flower, the dominant parent is homozygous for flower color. If the dominant parent was double heterozygous (TtWw), the F

1

generation would exhibit recessive traits of both plant height and flower color. But all F

1

generation exhibits violet flowers which confirm that the dominant parent is homozygous for flower color. Thus the correct answer is option C.