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Assertion (A): Dominance is not an autonomous feature of gene
Reason (R): Two traits show up equally in the heterozygote's phenotype in codominance
Reason (R): Two traits show up equally in the heterozygote's phenotype in codominance
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Important Questions on Principles of Inheritance and Variation
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Study the following statements and identify the correct combinations. The comect statements are
(i) Multiple alleles can occupy different loci on the same chromosome
(ii) Two alleles of gene can form three genotypes in a diploid organism
(iii) When more than two alleles exist in a population of a specific organism is called multiple allelisin
(iv) The number of phenotypes that can occur for multiple alleles is given by the expression
(v) A well-known example of multiple allelism is ' blood groups
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When homozygous 'A' blood group Man marries homozygous 'B' group Woman in generation and group of springs are born. When these individuals marry each other. in generation individuals with how many blood groups are born?
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Which pair is incorrect ?
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Match the following?
| List I | List II | List III | |||
| a) | Duchenne muscular dystrophy DMD | i) | Y- linked | p) | Impair blood clotting |
| b) | Hypertrichosis | ii) | Sex limited | q) | Expression is limited to only one sex |
| c) | Haemophilia | iii) | - linked recessive | r) | Progressive weakening of muscles |
| d) | Baldness | iv) | Holandric | s) | Excessive growth of hair on the pinna |
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Single gene can produce more than one effect, like starch synthesis in pea plant. It has two alleles (B and b) for starch synthesis the phenotypes of which are also given below BB, bb, Bb, which are correct?
(i) BB - round seed, large starch grain.
(ii) bb - wrinkled seed, less starch grain.
(iii) Bb - intermediate size seed, intermediate starch synthesis.
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Point mutation is caused in which of the following diseases?
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In man, which of the following genotypes and phenotypes may be the correct result of aneuploidy in sex chromosomes?
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Select the incorrect statement on Mutations ?
