If the stock contains 48 chromosomes and the scion contains 30 chromosomes , then how many chromosomes are present in the root and egg cell of the resultant plant , respectively ?

Options

A. 48 and 15
B. 15 and 48
C. 30 and 24
D. 24 and 15

Answer

To solve the problem, we need to determine the number of chromosomes present in the root and egg cell of the resultant plant when the stock has 48 chromosomes and the scion has 30 chromosomes.

### Step-by-Step Solution:

1. **Understanding the Terms:**
- The **stock** refers to the root system of the plant, which is responsible for anchoring the plant and providing nutrients.
- The **scion** is the upper part of the plant that is grafted onto the stock. It typically bears the flowers or fruits.

2. **Chromosome Count in the Stock:**
- The stock has a diploid number of chromosomes, which is given as 48.
- Since the root cells are somatic cells, they will also have the same diploid number of chromosomes as the stock.
- Therefore, the number of chromosomes in the root cell is **48**.

3. **Chromosome Count in the Scion:**
- The scion has a diploid number of chromosomes given as 30.
- The egg cell is a gamete formed from the scion, and gametes are haploid.
- To find the haploid number, we divide the diploid number by 2.
- Thus, the number of chromosomes in the egg cell is \( \frac{30}{2} = 15 \).

4. **Final Answer:**
- The number of chromosomes in the root cell of the resultant plant is **48**.
- The number of chromosomes in the egg cell of the resultant plant is **15**.

### Summary:
- **Root Cell Chromosomes:** 48
- **Egg Cell Chromosomes:** 15