Question

A dihybrid tall plant with yellow flowers (TtYy) was crossed with a dwarf plant bearing white flowers (ttyy). What percentage of progeny is expected to be homozygous tall bearing yellow flowers?

• A. 0%
• B. 25%
• C. 50%
• D. 75%

Answer 1

The correct option is A

0%

The tall parent produces 4 types of gametes - TY, Ty, tY, ty and recessive parent produces only one type of gamete - ty. Therefore the offsprings will have the following genotype - TtYy, Ttyy, ttYy and ttyy. There will be only one homozygous progeny with the genotype ttyy (that is dwarf plant with white flowers) recessive traits. There will be no progeny with the homozygous dominant traits (TTYY) - tall plant with yellow flowers.