3.8.3 Sex Determination and the Occurrence of Twins (Structured Questions)


Question 1:
Diagram 1 shows the schematic diagram of sex determination in human being.


(a) In Diagram 1, complete the sex chromosomes in gametes K and L. [2 marks]

(b) What is gamete L? [1 mark]

(c) State process B. [1 mark]

(d) State the sex of offspring M. [1 mark]

(e) Based on Diagram 1, state the percentage to get a baby boy. [1 mark]

Answer:
(a)
K : X, L : Y

(b)
Sperm

(c)
Fertilization

(d)
Girl

(e)
50%
 

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