List I | List II | ||
A. | Two or more alternative forms of a gene | I. | Back Cross |
B. | Cross of F1 progeny with homozygous recessive parent | II. | Ploidy |
C. | Cross of F1 progeny with any of the parents | III. | Allele |
D. | Number of chromosome sets in plant | IV. | Test cross |
A: | Out of one pair of factors, one is dominant and the other is recessive. |
B: | Alleles do not show any expression and both the characters appear as such in F2 generation. |
C: | Factors occur in pairs in normal diploid plants. |
D: | The discrete unit controlling a particular character is called factor. |
E: | The expression of only one of the parental characters is found in a monohybrid cross. |
List I | List II | ||
A. | Down's syndrome | I. | \(11^{\text {th }}\) chromosome |
B. | \(\alpha\) -Thalassemia | II. | \(' \mathrm{X} '\) chromosome |
C. | \(\beta\) -Thalassemia | III. | \(21^{\text {st }}\) chromosome |
D. | Klinefelter's syndrome |
IV. | \(16^{\text {th }}\) chromosome |
Assertion (A): | In honey bee population, sons do not have fathers but have grandfathers. |
Reason (R): | Haploidy in drones of honey bee is due to parthenogenesis while fertilisation results into female bees. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |