High School

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Nurf, who is heterozygous for blue color and has a stubby nose, carries a smurt that is purple and is heterozygous for a long nose.

[tex]
\[
\begin{tabular}{|c|c|c|c|}
\hline
BI & BI & b & bl \\
\hline
Bbul & Bbll & bbul & bbul \\
\hline
BbLI & BbLI & bbll & bb \\
\hline
Bbll & Bbll & bbll & bbll \\
\hline
Bbll & Bbll & bbll & \\
\hline
\end{tabular}
\]
[/tex]

1. Long nose (L) is dominant to stubby nose (I). Blue eyes (B) are dominant to purple eyes (b). What is the phenotype of BbLI?

A. Long nose, blue eyes
B. Long nose, purple eyes
C. Stubby nose, blue eyes
D. Stubby nose, purple eyes

Answer :

To determine the phenotype of an organism with the genotype BbLI, we need to understand what each letter in the genotype represents:

- B: This is the dominant allele for blue eyes.
- b: This is the recessive allele for purple eyes.
- L: This is the dominant allele for a long nose.
- I: This is the recessive allele for a stubby nose.

Phenotypes are traits that are expressed in an organism, and dominant alleles will mask the presence of recessive alleles. Here's the step-by-step reasoning:

1. Eye Color:
- The alleles for eye color in the genotype are B and b.
- Since B (blue eyes) is dominant over b (purple eyes), the presence of a B allele means that the organism will have blue eyes.

2. Nose Type:
- The alleles for nose type in the genotype are L and I.
- Since L (long nose) is dominant over I (stubby nose), the presence of an L allele means that the organism will have a long nose.

Putting it all together, the phenotype for the genotype BbLI is:

- Long Nose, Blue Eyes

This means the organism will have blue eyes and a long nose.

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