Assume that plant height and flower size in Four O\'Clock plants display antogon
ID: 191920 • Letter: A
Question
Assume that plant height and flower size in Four O'Clock plants display antogonistic phenotypes. Four O'Clock plants can be tall or short and the flowers can be large or small. Assume each trait is governed by alleles of a single gene and that each follows Mendel’s first and second laws. You start with two pure breeding strains, one that is tall with large flowers and a second that is short with small flowers. You cross these two strains to each other to generate F1 plants. You self-cross an F1 plant and grow 342 of the resulting seeds into plants. You find that 195 plants are short with large flowers, 62 plants are short with small flowers, 59 plants are tall with large flowers, and 26 plants are tall with small flowers.
You take each of the 62 plants are short with small flowers, self cross each of them and examine thousands of progeny plants. Among those thousands of plants you would expect to observe plants with which phenotypes? (Select 'Yes' or 'No' for each)
Yes No Short with large flowers
Yes No Tall with large flowers
Yes No Tall with small flowers
Yes No Medium height with medium size flowers
Yes No Short with small flowers
Yes No Can't tell from the information provided
Explanation / Answer
Pure breed of Tall with large flower TTFF × ttff Short with small flower
F1 generation : TtFf
selfing means TtFf × TtFf
F2 Generation TtFf/TTFf (tall with large flower)= 59
Ttff/TTff (tall with small flower)= 26
ttFf/ttFF(short with large flower)=195
ttff (short with small flower)=62
Self cross of ttff will always gives only ttff progeny. So only short with small flower is expected to be observed .
Result is:
No
No
No
No
Yes
No