Q. No.In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that:
1. The alleles of two genes are interacting with each other
2. It is a multigenic inheritance
3. It is a case of multiple allelism
4. The alleles of two genes are segregating independently
Which of the following will not result in variations among siblings?
1. Independent assortment of genes
2. Crossing over
3. Linkage
4. Mutation
Mendel’s Law of independent assortment holds good for genes situated on the:
1. non-homologous chromosomes
2. homologous chromosomes
3. extra nuclear genetic element
4. same chromosome
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Occasionally, a single gene may express more than one effect. The phenomenon is called:
| 1. | multiple allelism | 2. | mosaicism |
| 3. | pleiotropy | 4. | polygeny |
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In a certain taxon of insects, some have 17 chromosomes and others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are:
1. males and females, respectively
2. females and males, respectively
3. all males
4. all females
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The inheritance pattern of a gene over generations among humans is studied by pedigree analysis. The character studied in the pedigree analysis is equivalent to:
| 1. | quantitative trait | 2. | Mendelian trait |
| 3. | polygenic trait | 4. | maternal trait |
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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 |
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Two genes ‘A’ and ‘B’ are completely linked. In a dihybrid cross involving these two genes, the F1 heterozygote is crossed with a homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation?
| 1. | 1:1:1:1 | 2. | 9:3:3:1 |
| 3. | 3 : 1 | 4. | 1 : 1 |
In the F2 generation of a Mendelian dihybrid cross, the number of phenotypes and genotypes are:
1. phenotypes - 4; genotypes - 16
2. phenotypes - 9; genotypes - 4
3. phenotypes - 4; genotypes - 8
4. phenotypes - 4; genotypes – 9
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Mother and father of a person with ‘O’ blood group have ‘A’ and ‘B’ blood group, respectively. What would be the genotype of both mother and father?
1. Mother is homozygous for ‘A’ blood group and father is heterozygous for ‘B’
2. Mother is heterozygous for ‘A’ blood group and father is homozygous for ‘B’
3. Both mother and father are heterozygous for ‘A’ and ‘B’ blood group, respectively
4. Both mother and father are homozygous for ‘A’ and ‘B’ blood group, respectively
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