Photo AI
The diagrams show gametes and sex chromosomes - OCR Gateway - GCSE Biology - Question 12 - 2020 - Paper 2
Question 12
The diagrams show gametes and sex chromosomes. Which diagram shows the correct combination of sperm and egg to produce a male baby?
Worked Solution & Example Answer:The diagrams show gametes and sex chromosomes - OCR Gateway - GCSE Biology - Question 12 - 2020 - Paper 2
Step 1
Which diagram shows the correct combination of sperm and egg to produce a male baby?
Answer
To determine which diagram shows the correct combination of sperm and egg to produce a male baby, we need to understand the role of sex chromosomes in determining the sex of offspring.
In humans, males have one X and one Y chromosome (XY), while females have two X chromosomes (XX). A male baby is produced when a sperm carrying a Y chromosome fertilizes an egg carrying an X chromosome.
Looking at the diagrams:
- Diagram A shows an egg (X) with a sperm (Y), which does not contribute to producing a male baby.
- Diagram B shows an egg (X) with a sperm (X), which also does not produce a male child.
Thus, Diagram A is not the correct answer since it would lead to a female child, and Diagram B is the correct choice, as it shows the appropriate X and Y combination to produce a male baby.