Does geographical isolation of individuals of a species lead to formation of a new species? Provide a suitable explanation.

5

(a)

Differentiate between inherited and acquired characters. Give one example for each type.

5

(a)

Give reasons why acquired characters are not inherited.

5

(a)

In the following crosses write the characteristics of the progeny

Cross		Progeny
(a)	RR YY \(\times\) RR YY	...................
Round, yellow Round yellow		...................
(b)	Rr Yy \(\times\) Re Yy	...................
Round, yellow Round,		...................
(c)	rr yy \(\times\) rr yy	...................
Wrinkled, green wrinkled, green		...................
(d)	RR YY \(\times\) rr yy	...................
Round, yellow wrinkled green		...................

5

(a)

Study the following cross and showing self-pollination in F1, fill in the blank answer the question that follows
\(\underset { Round,yellow }{ RRYY } \times \underset { Wrinkled,green }{ rryy } F1-\underset { Round,yellow }{ Rr\quad Yy\times } \)

5

(a)

Give the basic features of the mechanism of inheritance.

5

(a)

Give reasons for the appearance of new combinations of characters in the F₂ progeny.

5

(a)

(a) Why did Mendel choose garden pea for his experiment? Write two reasons.
(b) List two contrasting visible characters of garden pea Mendel used for his experiment.
(c) Explain in brief how Mendel interpreted his results to show that the traits may be dominant or recessive.

5

(a)

Define evolution. How does it occur? Describe how fossils provide us evidences in support of evolution.

5

(a)

What is meant by speciation? List four factors which could lead to speciation. Which of these cannot be a major factor in the speciation of a self-pollinating plant species. Give reason to justify your answer.

5

(a)