NEET BIOLOGY

Detailed explanation-1: -Recessive alleles are those who cannot express themselves in presence of a dominant allele. So in heterozygous (e.g.Aa or Tt) condition, recessive alleles fail to express themselves. The only condition where they can express is a homozygous recessive condition (e.g. aa or tt).

Detailed explanation-2: -Homozygous means that the organism has two copies of the same allele for a gene. An organism can be homozygous dominant, if it carries two copies of the same dominant allele, or homozygous recessive, if it carries two copies of the same recessive allele.

Detailed explanation-3: -albinism. the genetically inherited condition in which there is a marked deficiency of pigmentation in skin, hair, and eyes. An individual with these traits is an “albino.” Since the gene for albinism is recessive, it only shows up in the phenotype of homozygous recessive people. This is a pleiotropic trait.

Detailed explanation-4: -Refers to a trait that is expressed only when genotype is homozygous; a trait that tends to be masked by other inherited traits, yet persists in a population among heterozygous genotypes.

Detailed explanation-5: -The recessive gene is one that expresses itself in homozygous condition.