4 Answer all the questions. SECTION A – Module B1 1
Look at the picture of a macaw.
(a) (i)
There are 70 chromosomes in each body cell of a macaw. Humans have 23 pairs of chromosomes in each body cell. How many pairs of chromosomes are in a body cell of a macaw? ...................................................................................................................................... [1]
(ii)
The macaw in the picture is male. Sex is determined by sex chromosomes. Write down the pair of sex chromosomes that are in each body cell of a human male. ........................................................... [1]
Š OCR 2013