Match each non-Mendelian genetic concept listed on the left with its corresponding biologi… — JAMB UTME

Match each non-Mendelian genetic concept listed on the left with its corresponding biological example or defining feature on the right.

Incomplete DominancePink flower color resulting from a cross between red and white snapdragons (*Antirrhinum majus*)
CodominanceSimultaneous and equal expression of both $I^A$ and $I^B$ cell-surface antigens in AB blood group individuals
Multiple AllelesThe existence of $I^A$ , $I^B$ , and $i$ gene variants controlling ABO blood groups within a population

Answer

Incomplete Dominance matches with pink flower color in snapdragons; Codominance matches with simultaneous expression of

I^A

and

I^B

antigens in AB blood group; Multiple Alleles matches with the existence of

I^A

I^B

, and

i

gene variants in a population.

Matching Incomplete Dominance to pink snapdragons correctly identifies intermediate phenotypic blending. Matching Codominance to blood type AB correctly identifies joint expression of two functional alleles. Matching Multiple Alleles to the ABO gene locus (

I^A

I^B

i

) correctly identifies gene loci that have more than two alternative allele variants within a population.

Step-by-Step Solution

Analyze Incomplete Dominance

Incomplete dominance involves a blending of phenotypes in heterozygous offspring.

Crossing red and white homozygous snapdragons produces pink heterozygous offspring because the single functional dominant allele produces insufficient pigment for full red expression.

Analyze Codominance

Codominance involves full, distinct, non-blended phenotypic expression of both inherited alleles.

Heterozygotes carrying both

I^A

and

I^B

alleles produce both A and B glycoprotein antigens on red blood cell surfaces equally.

Analyze Multiple Alleles

Multiple alleles describes a population-level genetic phenomenon where a single locus has more than two allele options.

While any diploid individual inherits only two alleles, the human population possesses three distinct alleles (

I^A

I^B

, and

i

) governing the ABO blood group locus.

Key Concept

Patterns of Non-Mendelian Inheritance (Incomplete Dominance, Codominance, Multiple Alleles)

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