Question

What do the progeny of a tall plant with round seeds and a short plant with wrinkled-seeds look like?

Answer 1

The phenotypic ratio in $F_2$ generation will be- 9:3:3:1

Step-by-step explanation:

The progeny of long plant with round seeds (TTRR) and 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 $F_2$ 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 $F_2$ generation will be- 9:3:3:1

Answer 2

Answer:the progeny or F1 generation will be tall plant with round seeds.F2 generation i.e., the progeny of F1 generation will be in the ratio 9:3:3:1

Explanation:see,tall plants with round seeds(TR) when crossed with short plants with wrinkled seeds(tr), all the progeny will be tall plants with round seeds due to the fact that tallness and round seeds are dominate traits while shortness and wrinkled seeds are recessive traits i.e. TR × tr -TtRr. Now when this F1 generation are self pollinated then the ratio of tall plants with round seeds, tall plants with wrinkled seeds, short plant with round seeds and short plant with wrinkled seeds is 9:3:3:1. For verification of the ratio, we have to count it so

TR Tr tR tr

TR TTRR TTRr TtRR TtRr

Tr TTRr TTrr TtRr Ttrr

tR TtRR TtRr TtRr ttRr

tr TtRr TtRr TtRr ttrr

T- tallness

t- shortness

R-round

r-wrinkled