Yellow colour is dominant over green colour. In a generation of 50% yellow and 50% green individuals, the parents are

Options

A. Both homozygous
B. Both heterozygous
C. One of them is heterozygous
D. None of the above

Answer

To solve the problem of determining the genotypes of the parents that produce a generation with 50% yellow and 50% green individuals, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Dominance**: Yellow color (Y) is dominant over green color (y). This means that any individual with at least one Y allele will display the yellow phenotype.

2. **Identify the Possible Genotypes**:
- The yellow phenotype can be represented by two possible genotypes:
- Homozygous dominant (YY)
- Heterozygous (Yy)
- The green phenotype can only be represented by the homozygous recessive genotype (yy).

3. **Analyze the Offspring Ratio**:
- In the given generation, there are 50% yellow and 50% green individuals. This indicates a classic Mendelian ratio of a monohybrid cross.

4. **Determine the Parent Genotypes**:
- If one parent is homozygous recessive (yy), the other parent must be heterozygous (Yy) to produce a 1:1 ratio of yellow to green offspring.
- The cross would look like this:
- Parent 1 (Yy) x Parent 2 (yy)
- Possible offspring:
- Yy (yellow)
- yy (green)
- This results in 50% yellow (Yy) and 50% green (yy).

5. **Conclusion**: Therefore, the parents must be one heterozygous yellow (Yy) and one homozygous green (yy).

### Final Answer:
The parents are one heterozygous yellow (Yy) and one homozygous green (yy).

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