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In Drosophila, red eye and white eye tra...

In Drosophila, red eye and white eye traits appear inboth male and female flies, when a cross is make between

A

White eyed female and red eyed male

B

White eyed male and homozyhgous red eyed female

C

White eyed male and heterozygous red eyed female

D

Red eyed male and heterozygous red eyed female

Text Solution

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The correct Answer is:
To solve the question regarding the inheritance of eye color traits in Drosophila (fruit flies), we need to analyze the genetic crosses between the different types of flies. Here’s a step-by-step solution: ### Step 1: Understand the Traits In Drosophila, the eye color trait can be red or white. The red eye trait is typically dominant over the white eye trait. This means that if a fly has at least one allele for red eyes, it will display red eyes. ### Step 2: Identify the Genotypes - **Red-eyed flies** can be either homozygous (RR) or heterozygous (Rr). - **White-eyed flies** are homozygous recessive (rr). ### Step 3: Analyze the Crosses We need to evaluate the crosses provided in the options: 1. White-eyed male (rr) and red-eyed female (Rr). 2. White-eyed male (rr) and homozygous red-eyed female (RR). 3. White-eyed male (rr) and heterozygous red-eyed female (Rr). 4. Red-eyed male (Rr) and heterozygous red-eyed female (Rr). ### Step 4: Determine the Offspring from Each Cross 1. **Cross 1**: rr (male) x Rr (female) - Offspring: 50% Rr (red) and 50% rr (white) 2. **Cross 2**: rr (male) x RR (female) - Offspring: 100% Rr (red) 3. **Cross 3**: rr (male) x Rr (female) - Offspring: 50% Rr (red) and 50% rr (white) 4. **Cross 4**: Rr (male) x Rr (female) - Offspring: 25% RR (red), 50% Rr (red), and 25% rr (white) ### Step 5: Identify the Correct Answer From the analysis, the crosses that produce both red-eyed and white-eyed offspring are: - Cross 1: rr (white-eyed male) x Rr (red-eyed female) produces both red and white-eyed offspring. - Cross 3: rr (white-eyed male) x Rr (red-eyed female) also produces both red and white-eyed offspring. The correct option from the provided choices is: **Option 3: White-eyed male (rr) and heterozygous red-eyed female (Rr)**. ### Final Answer The correct answer is: **White-eyed male and heterozygous red-eyed female (Option 3)**. ---
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