Question

. In mussels, brown coloring (B) is dominant, and blue coloring (b) is recessive.
A homozygous brown mussel crosses with a blue mussel. 3
How many of offspring are expected to be blue?

Answer 1

Answer:

F1 generation- 0% F2 generation-25%

Explanation:

in the F1 generation all offsprings will be brown because blue is a recessive trait

in the F2 generation after self fertilisation the genotypes will be Bb and Bb

so the offsprings will be BB,Bb,Bb and bb in the ratio of 1:2:1

brown:blue ratio will be 3:1

so 25% of offsprings will be blue

Answer 2

None of the offspring is expected to be blue. This is because

• The brown color is a dominant trait, this means, even in heterozygous conditions (Bb), brown color will be expressed. This is because the dominant gene (B) will mask the effect produced due to the recessive gene (b).
• When homozygous brown colored mussel is crossed with a blue colored mussel, all the offspring produced will be heterozygous (Bb). They will show brown colored trait.