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Q. No.In a dihybrid cross, AaBb X AaBb, assuming independent assortment, what proportion of progeny are expected to express either of the dominant phenotype?
1. 3/16 2. 6/16 3. 9/16 4. 1/16
Subtopic: Dihybrid Cross Analysis |
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Consider the given two statements:
| I: | In a test cross, the allele the individual in question [one that expresses the dominant phenotype] passes on, determines the phenotype of the offspring. |
| II: | The homozygous recessive individual can only pass on recessive alleles. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | I is correct but II is incorrect |
| 4. | I is incorrect but II is correct |
Subtopic: Monohybrid Cross: Further Understanding |
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Match the terms given in Column I with their given definition in Column II and select the correct match from the codes given:
Codes:
| COLUMN I | COLUMN II | ||
| A | Homozygous | P | having two different alleles of a particular gene or genes |
| B | Heterozygous | Q | having two identical alleles of a particular gene or genes |
| C | Homologous | R | not having the same alleles or genes in the same order of arrangement |
| D. | Heterologous | S | having the same alleles or genes in the same order of arrangement |
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | S | R | Q | P |
| 3. | Q | P | S | R |
| 4. | P | Q | S | R |
Subtopic: Introduction to Genetics: 1 |
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In a plant, genes A, B and C are located on different autosomes. Two plants with genotypes AaBbCc are inter-crossed. The number of phenotypes and genotypes that can occur in their progeny will respectively be:
| 1. | 6 and 8 | 2. | 8 and 9 |
| 3. | 4 and 16 | 4. | 8 and 27 |
Subtopic: Dominance Deviation from Mendel: 1 |
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Which of the following is not correct regarding polygenic inheritance?
1. Main mode of non-allelic genes interaction in corresponding gene series is addition of mainly small particular allele contributions.
2. The effects of allelic substitution at each of the segregating genes are usually relatively small and interchangeable which results that identical phenotype may be displayed by a great variety of genotypes.
3. The phenotypic expression of the polygenic characters is undergoing considerable modification by environmental influence.
4. Polygenic characters show a discontinuous rather than continuous distribution.
1. Main mode of non-allelic genes interaction in corresponding gene series is addition of mainly small particular allele contributions.
2. The effects of allelic substitution at each of the segregating genes are usually relatively small and interchangeable which results that identical phenotype may be displayed by a great variety of genotypes.
3. The phenotypic expression of the polygenic characters is undergoing considerable modification by environmental influence.
4. Polygenic characters show a discontinuous rather than continuous distribution.
Subtopic: Polygenic Inheritance & Pleiotropy |
53%
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Two genes located on the same autosome in an organism are 70 map unit apart. The recombination frequency between the two genes when a dihybrid cross is performed would be:
| 1. | 100 % | 2. | Less than 50 % |
| 3. | 25 % | 4. | 0 |
Subtopic: Recombination & Gene Mapping |
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The mode of inheritance shown by filled symbols in the given pedigree is most likely:
| 1. | Autosomal recessive | 2. | Autosomal dominant |
| 3. | Sex-linked recessive | 4. | Sex-linked dominant |
Subtopic: Pedigree Analysis: Basics | Pedigree Analysis: Problem Solving |
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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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In a test cross AaBb X aabb [assuming independent assortment], the ratio of progeny with genotypes AaBb and aabb will be:
| 1. | 1 : 1 | 2. | 3 : 1 |
| 3. | 1 : 1 : 1 : 1 | 4. | 9 : 1 |
Subtopic: Dihybrid Cross Analysis |
60%
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| Assertion (A): | The genetic sex of an individual with Klinefelter's syndrome is female |
| Reason (R): | Only X-chromosome is present in their genotype |
| 1. | Both (A) and (R) are True and the (R) is the correct explanation of the (A) |
| 2. | Both (A) and (R) are True but the (R) is not the correct explanation of the (A) |
| 3. | (A) is True but (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Sex Aneuploidy - Turner & Klinefelter Syndrome |
68%
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