Who determines the sex of an unborn child? Mention whether temperature has a role in sex determination.

Explanation

**Step-by-Step Solution:**

1. **Understanding Sex Determination in Humans:**
- In humans, sex determination is based on the combination of sex chromosomes contributed by each parent.
- Males have one X and one Y chromosome (XY), while females have two X chromosomes (XX).

2. **Identifying the Hetero-gametic Sex:**
- The term "hetero-gametic" refers to the sex that produces two different types of gametes (sperm in this case).
...