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Q. No.A plant breeder is raising many varieties of plants. As a part of the breeding program, he raises pure line varieties by continuous inbreeding over several generations – one with red flowers and another with white flowers. How can Mendel's laws be demonstrated by hybridization between these varieties?
| 1. | Set up a monohybrid cross and determine if your F2 results are predicted by a 3:1 ratio based on the law of segregation. |
| 2. | Set up a dihybrid cross and determine if your F2 results are predicted by a 9:3:3:1 ratio based on the law of independent assortment. |
| 3. | Set a test cross to demonstrate that your traits breed true. |
| 4. | Set up a two-point test cross to demonstrate that your genes are linked. |
Subtopic: Monohybrid Cross: 1 |
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Which of the following observations regarding a monohybrid cross cannot be explained with the Law of Dominance?
| 1. | Expression of only one of the parental characters in F1 |
| 2. | Expression of both parental characters in F2 |
| 3. | 3:1 phenotypic ratio in F2 |
| 4. | A gamete receives only one of the two-unit factors present in the parent |
Subtopic: Monohybrid Cross: 1 |
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It is said that Mendel proposed that the factor controlling any character is discrete and independent. His proposition was based on the:
| 1. | results of the F3 generation of a cross |
| 2. | observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending |
| 3. | self-pollination of F1 offspring |
| 4. | cross-pollination of F1 generation with recessive parent |
Subtopic: Monohybrid Cross: 1 |
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From NCERT
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One of the crosses conducted by Mendel was a ‘test cross’. This cross can be used to:
| 1. | determine whether the individual is heterozygous or homozygous dominant |
| 2. | determine whether a gene is located on a sex chromosome or an autosome |
| 3. | differentiate between incomplete dominance and codominance |
| 4. | identify linkage between two genes |
Subtopic: Monohybrid Cross: 1 |
90%
From NCERT
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A heterozygous tall pea plant is allowed to self-pollinate. What proportion of tall progeny will be heterozygous tall?
| 1. | ¼ | 2. | 2/3 |
| 3. | ½ | 4. | ¾ |
Subtopic: Monohybrid Cross: 1 |
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