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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.

Sutton and Boveri proposed the Chromosomal theory of inheritance.

The Chromosomal theory of inheritance states that

1. Chromosomes as well as genes occur in pairs.
2. Two alleles of a gene pair are located on the homologous sites of homologous chromosome
3. The chromosome segregate and assort independently just like the genes during meiosis.
4. They recombine at the time of fertilisation in the zygote to re establish the parental chromosome number.

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