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Final Exam

The table below shows the relationship between genotype and fur color in guinea pigs:

\begin{tabular}{|l|l|}
\hline
\multicolumn{1}{|c|}{Genotype} & \multicolumn{1}{c|}{Phenotype} \\
\hline
BB & Black fur \\
\hline
Bb & Black fur \\
\hline
bb & White fur \\
\hline
\end{tabular}

Question:
How can the genotype of a guinea pig with black fur be determined as heterozygous or homozygous?

A. Breed the guinea pig with another guinea pig that has black fur and check the coloring of each new guinea pig.
B. Breed the guinea pig with another guinea pig that has white fur and check the coloring of each new guinea pig.
C. Breed the guinea pig with another guinea pig that expresses the dominant trait for fur color and check the coloring of each new guinea pig.
D. Breed the guinea pig with another guinea pig that has a genotype of BB and check the coloring of each new guinea pig.



Answer :

GinnyAnswer
To determine whether a guinea pig with black fur is heterozygous (Bb) or homozygous (BB), you need to follow a specific breeding strategy. Let’s go through the detailed steps to identify the correct method:

1. Understanding Genotypes and Phenotypes:
- BB genotype results in black fur.
- Bb genotype also results in black fur.
- bb genotype results in white fur.

2. Parent Genotype Combinations:
- If the black-fur guinea pig is BB and we breed it with a white-fur guinea pig (bb):
- The possible offspring genotypes are: [tex]\( BB \times bb \Rightarrow Bb \quad (all offspring will have black fur).\)[/tex]
- If the black-fur guinea pig is Bb and we breed it with a white-fur guinea pig (bb):
- The possible offspring genotypes are: [tex]\( Bb \times bb \Rightarrow Bb \; (black fur) \;\; \& \;\; bb \; (white fur) \quad (in a 1:1 ratio).\)[/tex]

3. Breeding Strategy:
- To determine if the black-fur guinea pig is heterozygous (Bb) or homozygous (BB), you should breed it with a guinea pig that has white fur (bb).

4. Observation Analysis:
- If all offspring have black fur (Bb), then the black-fur parent is homozygous (BB).
- If any offspring have white fur (bb), then the black-fur parent is heterozygous (Bb).

Therefore, the correct approach is:

Breed the guinea pig with another guinea pig that has white fur and check the coloring of each new guinea pig.

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