NEET BIOLOGY

Detailed explanation-1: -Recessive alleles only express their phenotype if an organism carries two identical copies of the recessive allele, meaning it is homozygous for the recessive allele. This means that the genotype of an organism with a dominant phenotype may be either homozygous or heterozygous for the dominant allele.

Detailed explanation-2: -Codominance occurs when the alleles do not show any dominant and recessive allele relationship. However, each allele from homozygote is able to add phenotypic expressions in the offspring or simply the “mix” of each allele. The offspring’s phenotype is an intermediate of the parents’ homozygous traits.

Detailed explanation-3: -Co-dominant genes Not all genes are either dominant or recessive. Sometimes, each allele in the gene pair carries equal weight and will show up as a combined physical characteristic. For example, with blood groups, the A allele is as ‘strong’ as the B allele. The A and B alleles are said to be co-dominant.

Detailed explanation-4: -Definition. A phenotype that requires two copies of the causal variant in an individual to occur.

Detailed explanation-5: -Recessive alleles are only expressed when no dominant allele is present. In most sexually reproducing organisms, each individual has two alleles for each gene (one from each parent). This pair of alleles is called a genotype and determines the organism’s appearance, or phenotype.