Question

2. In a certain fish, blue scales (BB) and red scales (bb) are codominant. When a fish has the

Answer 1

Upon crossing BB with bb, we will get a hybrid of Bb.

• Codominance is a phenomena in genetics where two alleles (different forms of the same gene) express themselves equally in an organism. As a result, characteristics linked to each allele are shown at the same time.
• The MN blood group system in humans is an illustration of codominance. M and N alleles control the MN blood type. Red blood cells from people who are homozygous for the M allele carry a surface molecule known as the M antigen. On their red blood cells, those who are homozygous for the N allele contain the N antigen. A heterozygote is a person who carries both antigens.
• (a) Genotype of blue scales fish will be BB.
• (b) Genotype of blue scales fish will be bb.
• (c) Genotype of blue scales fish will be Bb.

So, in this case B and b alleles will express equally.

Learn more about co-dominance:

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