Question

6. Two peo plants one toll with round seeds (TTRR) and another short with wrinkled seeds
(tt) produce F, progeny that have toll with round seeds (TRI) when selling of F, plantsiis
done, the Fyprogeny will have new combination of characters. Which one of the following
are new combinations?
(1) Tall with wrinked seeds
(10) Tall with round seedha
(ID Short with wrinkled seeds.
(IV) Short with round seeds.
(a) () and (UD)
(b) () and (V)
(c) (1) and ()
(d) (1) and (IM
OR​

Answer 1

Answer:

The progeny of long plant with round seeds (TTRR) crossed with short plants with wrinkled seeds (ttrr) are all long plants with round seeds (TtRr). This is because tallness and round shape are both dominant traits while shortness and wrinkled shapes of seeds are recessive traits.

When F1 progeny (TtRr) are cross-bred by self pollination, then four types of progeny are produced in F2 generation. Out of these four types of progeny, two types will have traits like parents and the other two will have combination of traits. Thus,

1. Progeny with tall plants and round seeds- 9

2. Progeny with tall plants and wrinkled seeds-3

3. Progeny with short plants and round seeds-3

4. Progeny with short plants and wrinkled seeds-1

Thus, the phenotypic ratio in F2 generation will be- 9:3:3:1