Question

Pure tall plant Pure dwarf plant

Parent TT (Height = 15 cm.) tt (Height = 5 cm.)

Gamete T t

F${}_1$ generation Tt (Height = ?)

Hybrid tall

Find out the height of hybrid tall plant (Tt) in the given cross.

• A. 15 cm
• B. 10 cm
• C. 5 cm
• D. Can't say

Answer 1

Answer: (A)

15 cm

Theory of natural selection states that organic evolution occurs through natural selection and accumulation of inheritable variations which provide structural and functional superiority to some individuals over others in their survival and reproduction.

Here, tallness is dominant over dwarfness. In F${}_1$ generation, the dominant character, tallness is expressed in the heterozygous Tt. Thus, the height of the F${}_1$ hybrid is 15cm (same as that of the homozygous tall plant- TT).