Match each non-Mendelian genetic concept or inheritance pattern on the left with its corre… — JAMB UTME

Match each non-Mendelian genetic concept or inheritance pattern on the left with its corresponding cellular or phenotypic outcome on the right.

Incomplete dominanceHeterozygote displays a blended, intermediate phenotype distinct from either homozygote.
CodominanceHeterozygote fully and simultaneously expresses the distinct gene products of both alleles.
Multiple allelesMore than two alternative gene forms exist at a specific locus within a population.
Complete dominance ( $I^A$ over $i$ )A recessive allele's phenotypic effect is masked in the presence of a functional dominant allele.

Answer

Incomplete dominance matches blended intermediate phenotypes; Codominance matches simultaneous full expression of both alleles; Multiple alleles match having more than two gene forms in a population; Complete dominance (

I^A

over

i

) matches masking of the recessive allele.

Incomplete dominance is defined by intermediate trait blending in heterozygotes. Codominance is defined by simultaneous, unblended expression of both alleles. Multiple alleles refer to gene loci with more than two allele forms in a population pool. Complete dominance describes one allele fully masking a recessive allele in the heterozygous condition.

Step-by-Step Solution

Analyze Incomplete Dominance

In incomplete dominance, neither allele is completely dominant, producing an intermediate phenotype in heterozygotes.

Alleles interact such that heterozygotes possess a phenotype between both homozygous conditions.

Analyze Codominance

In codominance, both alleles are fully expressed without blending.

Both gene products remain distinct and functional in heterozygotes, as seen in AB blood group.

Analyze Multiple Alleles

Multiple alleles refer to three or more allele forms controlling one gene locus across a population.

Individual organisms inherit only two alleles, but population-level variation contains multiple alleles.

Analyze Complete Dominance (

I^A

over

i

)

The dominant allele

I^A

completely hides the effect of the recessive

i

allele.

Heterozygotes with genotype

I^A i

express blood group A phenotype identically to homozygous

I^A I^A

individuals.

Key Concept

Non-Mendelian Inheritance Patterns and Allelic Interactions

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