Principles Of Inheritance And Variation Worksheet - Class 12, Ws 5 (Page 3 of 3) in pdf

Principles Of Inheritance And Variation Worksheet - Class 12, Ws 5 Page 3

Inhertiance pattern of ABO blood groups in humans shows dominance, codominance

and multiple allelism. Explain each concept with the help of blood group genotypes.

14 Who proposed chromosomal theory of inheritance? Point out any two similarities in the

behaviour of chromosomes and genes.

15 Explain the mechanism of sex determination in insects like Drosophila and

grasshopper.

5 MARK QUESTIONS

A dihybrid heterozygous round, yellow seeded garden pea (Pisum sativum) was

crossed with a double recessive plant. (i) What type of cross is this? (ii) Work out

the genotype and phenotype of the progeny. (iii) What principle of Mendel is

illustrated through the result of this cross

17 Work out a monohybrid cross up to F2 generation between two pea plants and two

Antirrhinum plants both having contrasting traits with respect to colour of flower.

Comment on the pattern of inheritance in the crosses carried above.

VALUE BASED QUESTION

18 Anita was happy when she gave birth to her first child. Her in- laws were dissatisfied at

her not giving birth to a male child and blamed Anita. Anita tried to convince her in

laws that she had no role in the child’s gender. They understood the biological reason

but were yet to be satisfied. Anita’s husband took up the matter and convinced the

parents. a) What values did Anita’s husband show in the above situation? b) What

governs sex determination in humans? How is it different from birds? c) Why can’t Anita

be blamed for not giving birth to a male child?

Principles Of Inheritance And Variation Worksheet - Class 12, Ws 5 Page 3