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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.

Differences between Incomplete Dominance and Codominance

Incomplete Dominance	Co-Dominance
(1) Effect of one of the two alleles is more prominent.	(1) The effect of both the alleles is equally prominent.
(2) It produces a fine mixture or intermediate trait of the expression of two alleles.	(2) There is no mixing of the effect of the two alleles.
eg. flower color in Snapdragon.	eg. Co-dominanve of A and B alleles in ABO blood group system.

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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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