which genotype represents a true hybrid condition?

Options

A. tt rr
B. Tt rr
C. Tt Rr
D. TT Rr

Answer

To determine which genotype represents a true hybrid condition, we need to understand what a hybrid condition means in genetics. A true hybrid condition occurs when an organism has two different alleles for a particular gene, which is known as being heterozygous.

### Step-by-Step Solution:

1. **Understand the Definition of Hybrid**: A hybrid organism has two different alleles for a trait, meaning it is heterozygous for that trait. For example, if we consider a gene represented by 'T', a true hybrid would have one dominant allele (T) and one recessive allele (t), denoted as 'Tt'.

2. **Analyze the Given Options**:
- **Option 1**: Capital T, small t, small t, small r, small r (Tt, tt, rr) - Here, Tt is heterozygous, but tt is homozygous recessive. This does not represent a true hybrid condition for both traits.
- **Option 2**: Tt, rr - In this case, Tt is heterozygous, but rr is homozygous recessive. This also does not represent a true hybrid condition for both traits.
- **Option 3**: Tt, Rr - Here, both Tt and Rr are heterozygous. This represents a true hybrid condition for both traits.
- **Option 4**: Capital T, capital T, capital R, small r (TT, RR) - Both are homozygous dominant and do not represent a hybrid condition.

3. **Identify the Correct Answer**: Based on the analysis, only Option 3 (Tt, Rr) represents a true hybrid condition as both alleles are in heterozygous states.

### Final Answer:
The genotype that represents a true hybrid condition is **Tt, Rr** (Option 3).

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