Question

1. what will be the phenotype of the fly that grows from the fertilized cell shown below?

allele key
dominant: c - curly wing, b - brown body, l - legs on head, r - red eyes
recessive: c - normal wing, b - black body, l - antenna, r - orange eyes
options:

• normal wings, black body, antenna, and red eyes.
• curly wings, brown body, legs on head, and red eyes.
• curly wings, brown body, legs on head, and orange eyes.
• normal wings, brown body, legs on head, and red eyes.

Explanation:

Step1: Identify wing alleles

The cell has alleles $C$ (dominant) and $c$ (recessive). Dominant $C$ is expressed: Curly wing.

Step2: Identify body color alleles

The cell has alleles $B$ (dominant) and $b$ (recessive). Dominant $B$ is expressed: Brown body.

Step3: Identify head appendage alleles

The cell has alleles $L$ (dominant) and $l$ (recessive). Dominant $L$ is expressed: Legs on head.

Step4: Identify eye color alleles

The cell has two $R$ (dominant) alleles. Dominant $R$ is expressed: Red eyes.

Step5: Match to options

Combine the expressed traits to find the matching option.

Answer:

Curly wings, brown body, legs on head, and red eyes.