Both males and females have same number of chromosomes in

Options

A. XX - XY type
B. XX - XO type
C. ZZ - ZO type
D. Honey bees

Answer

### Step-by-Step Solution:

1. **Understanding Chromosome Count**:
- In humans, each somatic (body) cell contains a diploid number of chromosomes, which is 2N. For humans, this means there are 46 chromosomes in total.

2. **Identifying Chromosome Types**:
- Out of the 46 chromosomes, 44 are autosomes (non-sex chromosomes) and 2 are sex chromosomes. The sex chromosomes determine the sex of the individual.

3. **Sex Chromosome Composition**:
- In males, the sex chromosomes are one X and one Y (XY), while in females, the sex chromosomes are two X chromosomes (XX).

4. **Mechanism of Sex Determination**:
- Males are termed heterogametic because they have two different sex chromosomes (X and Y). During spermatogenesis, males produce two types of sperm: half carry the X chromosome and half carry the Y chromosome.
- Females are homogametic, producing only one type of egg, which carries the X chromosome.

5. **Fertilization Outcomes**:
- If a sperm carrying the X chromosome fertilizes the egg, the offspring will be female (XX). If a sperm carrying the Y chromosome fertilizes the egg, the offspring will be male (XY).

6. **Conclusion on Chromosome Count**:
- Regardless of the sex of the individual, the total number of chromosomes remains the same: 46 chromosomes (2N) in both males and females. Thus, both sexes have the same number of chromosomes in the XY sex determination system.