Question

Which of the following pairs is wrongly matched?

• A. XO type sex determination: Grasshopper
• B. Starch synthesis in pea: Multiple alleles
• C. T.H. Morgan: Linkage
• D. ABO blood grouping: Codominance

Answer 1

The correct option is B

Starch synthesis in pea: Multiple alleles

The correct option is B.

Explanation of the correct option:

1. The incorrectly matched pair among the provided pairs is ‘Starch synthesis in pea: Multiple alleles.’
2. The synthesis of starch in pea plants is controlled by a single gene with two alleles, B and b.
3. Hence, starch synthesis in peas doesn't consist of multiple alleles.

Explanation of the incorrect options:

Option A:

1. The XO sex determination seen in grasshoppers is also seen in other insects.
2. In this sex determination procedure, a female will have two X chromosomes displayed as XX while a man will have only one X chromosome known as the XO.

Option C:

T.H. Morgan discovered linkage in Drosophila melanogaster, a genetic inheritance process in which the chromosome with a certain gene has a tendency to be passed on jointly.

Option D:

1. Codominance occurs when both alleles of a pair morphologically reveal themselves entirely in the F1 hybrid.
2. This phenomenon can be illustrated using the human ABO blood group, where the major four blood categories A, B, AB, and O are the responsibility of three alleles.

Final Answer: Starch synthesis in pea: Multiple alleles is wrongly matched.