Question

In a variety of cornflowers in which blue flowers and dwarf plants are controlled by dominant genes carried on separate pairs of chromosomes, and white flowers and tall plants are their recessive counterparts, assume a cross has been made between a homozygous blue, dwarf plant and a homozygous white, tall plant. Which of the followingwould be represented in the F1generation?

A. BBDD
B. BBdd
C. bbDD
D.BbDd
E. BbDD

Answer 1

Answer:

D. BbDd

Explanation:

According to the given information, the allele for blue flowers (B) is dominant over the allele for white flowers (b).

And the allele for dwarf plants (D) is dominant over the allele for tall plants (d).

The genotype of the homozygous blue, dwarf parent plant would be "BBDD" while that of the homozygous white, tall parent plant would be "bbdd".

A cross between BBDD x bbdd would obtain all BbDd (heterozygous blue, dwarf plants) progeny in F1 generation.

Parent plants:   BBDD   X   bbdd

Gametes:          BD                   bd

F1 progeny:                 BbDd