Question

Match List I (Sex constitution symbol) with List II (organism)

Choose the correct answer from the options given below:

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

Hint:

XX-XY = Drosophila/Mammals; XX-XO = Grasshopper; XO-XX = Fumea; ZW-ZZ = Birds (female heterogamety).

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Organisms employ distinct allosomal sex determination systems based on male or female heterogamety.

Step 2: Detailed Explanation:
Matching chromosomal sex mechanisms with representative organisms:
1. XX-XY mechanism (Male heterogametic XY, female XX) (A) $\to$ Drosophila melanogaster and humans (IV).
2. XX-XO mechanism (Male heterogametic XO with single X chromosome, female XX) (B) $\to$ Grasshopper and bugs (III).
3. XO-XX mechanism (Female heterogametic XO, male XX) (C) $\to$ Fumea moth (I).
4. ZW-ZZ mechanism (Female heterogametic ZW, male homogametic ZZ) (D) $\to$ Birds, butterflies, and reptiles (II).

Step 3: Final Answer:
Matching summary: A $\to$ IV, B $\to$ III, C $\to$ I, D $\to$ II.