Question

1. some dragons can breathe fire. not breathing fire (b) is dominant to breathing fire (b). complete the punnett square to cross a heterozygous mom with a homozygous recessive dad.

a. how many genotypes show up?
b. what are they?
c. what percentage of offspring can breathe fire?

Explanation:

Step1: Determine the parents' genotypes

The heterozygous mom has the genotype \(Bb\) (since she has one dominant \(B\) and one recessive \(b\)). The homozygous recessive dad has the genotype \(bb\) (two recessive alleles).

Step2: Set up the Punnett square

The mom can contribute \(B\) or \(b\) alleles. The dad can only contribute \(b\) alleles.

	\(B\)	\(b\)
\(b\)	\(Bb\)	\(bb\)

Step3: Analyze genotypes

From the Punnett square, the genotypes are \(Bb\) and \(bb\).

Step4: Calculate percentage of fire - breathing offspring

Fire - breathing is the recessive trait (\(bb\)). There are 2 \(bb\) out of 4 total offspring. The percentage is \(\frac{2}{4}\times100\% = 50\%\)

Answer:

A. 2 genotypes show up.
B. They are \(Bb\) and \(bb\).
C. 50% of the offspring can breathe fire.