Assertion: | Multiple alleles can be found only when population studies are made. |
Reason: | Multiple alleles for the same gene are always located on heterologous chromosomes. |
1. | the Law of Independent Assortment. |
2. | the concept of Linkage |
3. | the chromosomal theory of inheritance. |
4. | the One Gene One Enzyme hypothesis. |
Statement I: | The fruit fly is a popular choice as a model organism in genetics. |
Statement II: | It has a very long generation time and low fecundity (females lay only a few eggs in life time). |
1. | Statement I is correct; Statement II is correct |
2. | Statement I is correct; Statement II is incorrect |
3. | Statement I is incorrect; Statement II is correct |
4. | Statement I is incorrect; Statement II is incorrect |
1. | the proportion of parental gene combinations were much lower than the non-parental type. |
2. | the proportion of parental gene combinations were much higher than the non-parental type. |
3. | the proportion of parental gene combinations were equal to the non-parental type. |
4. | only the parental gene combinations were seen in the progeny. |
Statement I: | Because of independent assortment and dominance, the 9:3:3:1 dihybrid phenotypic ratio can be collapsed into two 3:1 ratios, characteristic of any monohybrid cross that follows a dominant and recessive pattern. |
Statement II: | The law of independent assortment also indicates that a cross between yellow, wrinkled (YYrr) and green, round (yyRR) parents would yield the same F1 and F2 offspring as in the YYRR x yyrr cross. |