An offspring of two homozygous parents differing from one another by alleles at only one gene locus is known as :-

Options

A. Back cross
B. Monohybrid
C. Dihybrid
D. Trihybrid

Answer

To solve the question, "An offspring of two homozygous parents differing from one another by alleles at only one gene locus is known as:", we can follow these steps:

### Step 1: Understand the Terms
- **Homozygous Parents**: These are parents that have two identical alleles for a particular gene. For example, one parent could be homozygous dominant (AA) and the other homozygous recessive (aa).
- **Gene Locus**: This refers to the specific location of a gene on a chromosome.

### Step 2: Analyze the Question
- The question specifies that we are looking for an offspring resulting from two homozygous parents that differ by alleles at only one gene locus. This means we are focusing on a single trait or characteristic.

### Step 3: Review the Options
- **Back Cross**: This involves crossing a hybrid organism with one of its parents or with an organism genetically similar to its parents. This does not fit our scenario since both parents are homozygous.
- **Monohybrid Cross**: This is a genetic cross that involves one trait (one gene locus) where the parents differ by one allele. This fits our scenario perfectly.
- **Dihybrid Cross**: This involves two traits (two gene loci), which is not applicable here.
- **Trihybrid Cross**: This involves three traits (three gene loci), which is also not applicable.

### Step 4: Identify the Correct Answer
- Since the question describes an offspring from two homozygous parents differing at only one gene locus, the correct answer is **Monohybrid Cross**.

### Final Answer
The offspring of two homozygous parents differing from one another by alleles at only one gene locus is known as a **Monohybrid Cross**.

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