Sex Determination Practice Questions

Question 1

Q1. Knowledge Recall (1 mark)

Define genetic sex and provide an example.

Question 2

Q2. Application of Knowledge (2 marks)

In fruit flies, males are XY and females are XX. If a male fruit fly with genotype X^RX^Y mates with a homozygous recessive female X^rX^r, what is the expected sex ratio of their offspring?

Question 3

Q3. Knowledge Recall (2 marks)

Describe the role of the SRY gene in sex determination in humans.

Question 4

Q4. Application of Knowledge (3 marks)

Explain how the relative length of daylight hours affects the timing of sexual maturity in some animals.

Question 5

Q5. Data Analysis (3 marks)

The table shows the sex ratio of offspring for different species of birds:

**Species**

**Sex Ratio (Male:Female)**

Eagle

2:1

Parrot

1:1

Explain the potential reasons for these sex ratio variations.

Question 6

Q6. Knowledge Recall (1 mark)

What is the difference between genotype and phenotype?

Question 7

Q7. Application of Knowledge (2 marks)

In turtles, the temperature at which eggs are incubated determines the sex of the offspring. How might this adaptation be beneficial for turtle populations?

Question 8

Q8. Knowledge Recall (2 marks)

Describe the sex-linked gene and provide an example of an inherited sex-linked trait.

Question 9

Q9. Data Analysis (4 marks)

The graph shows the proportion of red-green colour-blind males and females in a population:

Ostrich

1:3

**Colour Blindness**

**Males**

**Females**

Present

0.08

0.005

Explain the pattern shown in the graph.

Question 10

Q10. Application of Knowledge (3 marks)

Discuss the ethical implications of genetic testing for sex-linked diseases.

Absent

0.92

0.995

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