Question

In dragons, the allele for fire-breathing is dominant over dragons who cannot breathe fire. If a homozygous fire-breathing dragon is crossed with a dragon that does not breathe fire, how many offspring will be fire-breathers? Let letter B represent the dominant allele and letter b represent the recessive allele. Show your work with a Punnett square and state the answer.

Answer 1

A cross between a homozygous fire-breathing dragon (BB) and a dragon that does not breath fire (bb) will produce the following offspring:

100% heterozygous (Bb) or 50% probability of fire breathers and 50% probability of dragons that does not breath fire.