Question

In a flowering plant, blue flower (B) trait is dominant to white flower (b) trait. A true-breeding blue flower plant (BB) is crossed with another true-breeding white flower plant (bb). What percentage of offspring are expected to have blue flowers? Choose 1 answer: Choose 1 answer: (Choice A) A 000 percent (Choice B) B 505050 percent (Choice C) C 757575 percent (Choice D) D 100100100 percent

Answer 1

Answer:

The correct answer is:

100100100 percent (D)

Explanation:

To begin, let us express the alleles for each trait:

Blue flower (B) (dominant)

White flower (b) (recessive)

Parents:

1. True breeding blue flower (BB)

2. True breeding white flower (bb)

Now let us do the crossing:

           

                  b              b

B                 Bb           Bb

B                 Bb           Bb

From the cross, it is seen that out of 4 offspring, the genotypes were 'Bb' while are flowers that are phenotypically blue in color. Hence, all the offspring have blue flowers.

Answer 2

Answer: D. 100%

Explanation:

One parent is with is a true breeding blue flowering plants this means the two alleles of the genotype are homozygous dominant alleles (BB).

The other parent is a true breeding with flowering plant, this means the two alleles of the genotype are homozygous recessive alleles (BB).

When both parents are crossed, the possible genotype outcome is

B B  *  b b

Bb Bb Bb Bb

Therefore since the blue flowering plant allele (B) is dominant to the white flowering plant allele (b) the probability of an offspring outcome to be a blue flowering plant is 4/4 which is 100%.44

Answer is 100%