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Principles of Inheritance and Variation

Long Answer Type

41. A black-colour cock when bred with a white coloured hen produced steel blue coloured offspring and when inbred, black, white and steel-blue coloured progeny were obtained:
(a) This result is genetically explained as.
(b) What will be the expected ratio and proportions of black, steel-blue and white progeny?

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Short Answer Type

42.

Explain the following terms with example
(a) Co-dominance
(b) Incomplete dominance

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43. Differentiate incomplete dominance and codominance.

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Long Answer Type

44. In man four types of blood groups A, B, AB and O are controlled by three alleles of a gene. What is the mechanism of inheritance of the blood groups ?

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Short Answer Type

45. What will be the blood groups of the children of following matings ?

(a) IA IB x IBIB
(b) IAI° x IAIB
(c) IA IB x IAIB
(d) I° I° x IAIB.

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Long Answer Type

46.

Child has blood group O. If the father has blood group A and mother blood group B, work out the genotypes of the parents and the possible genotypes of the other offsprings.

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47. Who proposed the chromosome theory of inheritance ? What does the Chromosomal theory of inheritance.

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Short Answer Type

48. Correlate between behaviour of genes and chromosomes during meiosis in higher organisms.

The correlation between the behaviour of genes and chromosomes during meiosis is that they both behave in a similar manner. For example

During meiosis

1. Both chrosomes and gene occur in pairs initially.

2. Two alleles of a gene pair as well as the chromosome pair segregate independently during gamete formation.

3. Different genes as well as different (non-homologous) chromosomes assort independently during gamete formation.

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