Question

Define dominance and recessive trait.

Answer 1

Dominance

• It is able to express itself even in the presence of its recessive allele.

• It does not require another similar allele to produce its effect on the phenotype, e.g., TT is tall.

• Dominant allele or factor can form complete polypeptide or enzyme for expressing its effects, e.g., violet colour of flower in pea.

Recessive

• Recessive allele or factor is unable to express its effect in the presence of dominant allele.

• It produces its phenotypic effect only in the presence of a similar allele, e.g., tt is dwarf.

• The recessive allele forms an incomplete or defective polypeptide or enzyme so that the expression consists of absence of the effect of dominant allele, e.g., white flower colour in pea.