Question

Complete the following dibhybrid cross​

Answer 1

Genotype              Phenotype

BB                              Barbed

Bb                               Barbed

bb                              Smooth

NN                           Non-Resistance                          

Nn                            Non-Resistance

nn                            Resistance

Explanation:

Since we know that B is dominant over b,

B = Barbed

b = smooth

Only homozygous recessive (bb) will have a smooth antenna. Both BB and Bb will have barbed antennas.

Similarly, N is dominant over n

N = non-resistance to pesticides

n = resistance to pesticides.

Only homozygous recessive (nn) will have a resistance to pesticides. Both NN and Nn will have no-resistance.