The diagram shows the sex chromosomes of a human couple- A- B- and four of their chidren- C- D- E and F- -3 MARKS-Fig- 2-12ai Which parents is the mother-ii Explain why did you choose this parent-b Another child is expected- What are the chances of it being a girl-

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Standard X

Biology

Sex Determination

The diagram s...

Question

The diagram shows the sex chromosomes of a human couple, A, B, and four of their chidren, C, D, E and F. [3 MARKS]

(a)
(i) Which parents is the mother?
(ii) Explain why did you choose this parent.
(b) Another child is expected. What are the chances of it being a girl?

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Solution

a) 2 Marks
b) 1 Mark

(a)
(i) Parent A is the mother.
(ii) Because parent A has XX chromosomes or both sex chromosomes are the same.
(b) The chances of it being a girl is 50/50.

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The diagram shows the sex chromosomes of a human couple, A, B, and four of their chidren, C, D, E and F. [3 MARKS] (a) (i) Which parents is the mother? (ii) Explain why did you choose this parent. (b) Another child is expected. What are the chances of it being a girl?

a) 2 Marks b) 1 Mark (a) (i) Parent A is the mother. (ii) Because parent A has XX chromosomes or both sex chromosomes are the same. (b) The chances of it being a girl is 50/50.

The diagram shows the sex chromosomes of a human couple, A, B, and four of their chidren, C, D, E and F. [3 MARKS]

(a)
(i) Which parents is the mother?
(ii) Explain why did you choose this parent.
(b) Another child is expected. What are the chances of it being a girl?

a) 2 Marks
b) 1 Mark

(a)
(i) Parent A is the mother.
(ii) Because parent A has XX chromosomes or both sex chromosomes are the same.
(b) The chances of it being a girl is 50/50.