Sex-Associated Traits: Match the Column
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Question (English)
Match the column:
| TABLE-I | TABLE-II |
|---|---|
| 1) Sex-linked traits | a) Milk production |
| 2) Sex-influenced traits | b) Broodiness in poultry |
| 3) Sex-limited traits | c) Horn condition in sheep |
| 4) Multiple allelism | d) Double muscling gene in cattle |
| 5) Pleiotropy | e) ABO blood group in human |
- 1-b, 2-c, 3-a, 4-e, 5-d ✓ Correct
- 1-a, 2-b, 3-c, 4-d, 5-e
- 1-c, 2-a, 3-b, 4-d, 5-e
- 1-b, 2-a, 3-e, 4-c, 5-d
Explanation:
Correct Answer: 1-b, 2-c, 3-a, 4-e, 5-d
From Table 6 (Inheritance of Characters) in the notes:
- 1. Sex-linked traits (b) = Broodiness in poultry: Gene on sex chromosome (X or Z). Also includes barred plumage, rapid/slow feathering, cryptorchidism in horse, haemophilia, colour blindness.
- 2. Sex-influenced traits (c) = Horn condition in sheep: Gene on autosome. Different expression in males vs. females due to sex hormones. In Dorset sheep, horned is dominant in males but recessive in females.
- 3. Sex-limited traits (a) = Milk production: Gene on autosome. Expressed in only one sex. Also includes semen production, egg production, baldness, secondary sexual characters.
- 4. Multiple allelism (e) = ABO blood group in human: More than two alleles at the same locus — IA, IB, IO (3 alleles). Produced by mutation. Present in population, not in a single individual. Possible genotypes = N(N+1)/2 = 3(4)/2 = 6.
- 5. Pleiotropy (d) = Double muscling gene in cattle: One gene controlling multiple traits. Also: sickle cell anemia gene, halothane gene in pigs.
