When a green pod containing pea plant is crossed with a yellow pod containing pea plant in the progeny yellow pod containing plants are also produced, so green pod containing plant is

Options

A. only heterozygous
B. only homozygous
C. may be homozygous or heterozygous
D. may be homozygous

Answer

To solve the question, we need to analyze the genetic traits of the pea plants involved in the cross. The traits in question are the pod colors: green and yellow.

### Step-by-Step Solution:

1. **Identify Traits and Dominance**:
- Green pod color is dominant (denote it as "G").
- Yellow pod color is recessive (denote it as "g").

2. **Determine Genotypes**:
- A green pod plant can either be homozygous dominant (GG) or heterozygous (Gg).
- A yellow pod plant must be homozygous recessive (gg).

3. **Cross the Plants**:
- When we cross a green pod plant (which could be GG or Gg) with a yellow pod plant (gg), we need to analyze the possible offspring.
- If the green pod plant is homozygous (GG), all offspring will be green (GG x gg → all Gg).
- If the green pod plant is heterozygous (Gg), the offspring will be a mix of green and yellow pods (Gg x gg → 50% Gg (green) and 50% gg (yellow)).

4. **Analyze Progeny**:
- The question states that yellow pod plants are produced in the progeny. This indicates that the green pod parent cannot be homozygous (GG) because that would not produce any yellow pod plants.
- Therefore, the green pod plant must be heterozygous (Gg).

5. **Conclusion**:
- Since yellow pod plants are produced in the progeny, the green pod plant is confirmed to be heterozygous (Gg).

### Final Answer:
The green pod containing plant is **only heterozygous (Option A)**.

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