1

In humans, brown eye color is recessive to black eye color. A man and his wife have black eyes; however, out of their 3 children, 2 have black eyes and one has brown eyes.

Using proper symbols to denote alleles, write the

i) Genotype of parents

ii) Possible genotype of black eyed offsprings

iii) genotype of brown eyed offspring

2

How is it possible for purple colored pea plant to produce white colored flowers?

3

A study found that children with light colored eyes are likely to have parents with light colored eyes. On this basis, can you say whether light eyes is a dominant or a recessive trait.Why / why not.

4

The genotype of green stemmed tomato plant is denoted as GG and that of purple stemmed tomato plant as gg. When the 2 are crossed

i) what color of stem would you expect in F1.

ii) What will be the % of purple stemmed plants if F1 plants are self pollinated.

iii) In what ratio would you find the genotype GG and Gg in F2 progeny.

iv) What is the term used for this type of cross.

5

How did Mendel exhibit that the traits are independently inherited?

6

What are genes? Where are they located in a cell. How do they control traits, explain with an example.

7

Study the follwing data and answer the questions that follow,