[2 Mark Question Answer]

Question 12 Marks

Two pairs (A & B) of rabbits were crossed as given below:

(a) Can you tell which coat colour (black or white) is dominant? ________ .
(b) Is the coat colour sex-linked? ________ .

Answer

(a) Black
(b) No

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Question 22 Marks

In a certain species of animals, black fur (B) is dominant over brown fur (b) Show the possible ratio of genotypes and phenotypes of the offspring of the pure breeding different coloured parents.

Answer

Phenotypic Ratio - 3 (Black Fur) :1 (Brown Fur)
Genotypic Ratio - 1(Homozygous Black Fur):2 (Heterozygous Black Fur): 1 (Homozygous Brown Fur)

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Question 32 Marks

Among lion, tiger and domestic cat, al the three have the same number of 38 chromosomes, yet they have different appearances. How do you account for such differences?

Answer

The characteristics of a species such as physical appearance, body functions and behavior are not only the outcome of chromosome number, but these depend on the genotype of every organism. That means the set of genes present in the organisms may vary and therefore lion, tiger and domestic cat have the same number of 38 chromosomes, their characteristics (like different appearances) are the result of the genes located on the chromosomes.

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Question 42 Marks

Differentiate between :
character and trait.

Answer

	Character		Trait
1.	Any heritable feature is called a character.	1.	The alternative form of a character is called trait.

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Question 52 Marks

Explain the following term : Pedigree chart

Answer

Pedigree Chart:
A pedigree chart is a diagram that shows the occurrence and appearance of phenotypes or a particular gene or organism and its ancestors from one generation to the next. In the pedigree chart, males are shown by squares and females by circles.

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Biology [2 Mark Question Answer]

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