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Earn 100
Among the following characters, which one was not considered by Mendel in his experiments on pea?
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Important Questions on Principles of Inheritance and Variation
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The mechanism that causes a gene to move from one linkage group to another is called:
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A true breeding plant is:
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If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is
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Which of the following most appropriately describes haemophilia?
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A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the plants were selfed the resulting genotypes were in the ratio
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Match the terms in Column-I with their description in Column-II and choose the correct option:
| Column – I | Column – II |
| (a) Dominance | (i) Many genes govern a single character |
| (b) Codominance | (ii) In a heterozygous organism, only one allele expresses itself |
| (c) Pleiotropy | (iii) In a heterozygous organism, both alleles express themselves fully |
| (d) Polygenic inheritance | (iv) A single gene influences many characters |
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Pick out the correct statements:
(i) Haemophilia is a sex-linked recessive disease.
(ii) Down's syndrome is due to aneuploidy.
(iii) Phenylketonuria is an autosomal recessive gene disorder.
(iv) Sickle cell anaemia is an X-linked recessive gene disorder.
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In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:
