Question

Match the following
$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{I. Co-dominance}& \text{A. Blue colour in Andalusian fowls}\\ \text{II. Multiple alleles}& \text{B. AB blood group in humans}\\ \text{III. Recessive trait}& \text{C. Coat colour in rabbits}\\ \text{IV. Incomplete dominance}& \text{D. Wrinkled seed shape in pea}\end{array}$

• A. I-C, II-D, III-B, IV-A
• B. I-B, II-C, III-D, IV-A
• C. I-A, II-C, III-D, IV-B
• D. I-A, II-B, III-D, IV-C

Answer 1

The correct option is B I-B, II-C, III-D, IV-A

The blood group AB in humans is produced due to co-dominant alleles for A and B groups.
Individuals who have inherited one $I^A$ and one $I^B$ allele from their parents express both the alleles resulting in the phenotype of AB blood group.

An example of multiple alleles is coat colour in rabbits.

Here, four alleles exist for the C gene.
The wild-type version, $C^{+}{C}^{+}$, is expressed as brown fur.

The chinchilla phenotype, $C^{ch}{C}^{ch}$, is expressed as black-tipped white fur.

The Himalayan phenotype, $C^h{C}^h$, has black fur on the extremities and white fur elsewhere.

Finally, the albino, or “colourless” phenotype, c c, is expressed as white fur.

Seed shape was one of the seven characteristics of the pea plant picked up by Mendel for his experiments. The wrinkled seed shape is a recessive trait, while the round shape is dominant.

Andalusian fowls have two pure forms, black and white which are controlled by incompletely dominant alleles. When fowls with black and white colour are crossed, the resulting offspring has blue colour. This is an example of incomplete dominance.