This question was not a popu1ar one and many candidates avoided it. Many candidates who
attempted it did not score high marks.
In stating inheritable characters many candidates stated skin, colour, hair colour, eye colour
which earned them just one mark for colour. Some stated blood instead of blood group,
anaemia instead of sickle cell anaemia and so lost marks. Many candidates could correctly
name the site of meiosis in plants but in animals they named gonads rather than testes and
ovary and so lost some marks.
A number of candidates cou1d correctly state the differences between mitosis and meiosis but
many candidates answer did not correspond and so they lost marks. Expected answers include:
DIFFERENCES BETWEEN MITOSIS AND MEIOSIS

MITOSIS	MEIOSIS
Nucleus divides only once	Nucleus divides twice
Number of chromosomes remains the same	Number of chromosomes is halved after
after division/diploid.	division/diploid.
Homologous chromosomes do not associate	Homologous chromosomes associate to form
	bivalents
Chiasmata are never formed	Chiasmata are formed
Crossing - over never occurs/no exchange of	Crossing - over occurs/exchange of genetic
genetic materials	materials occurs
Daughter cells identical to parent cell	Daughter cells generally different from parent
	cell;
Two daughter cells are formed	Four daughter cells are formed
Chromosomes form single row at the equator	Chromosomes form double row at the equator
Occurs in somatic cell	Occurs in reproductive cell
Occurs in a sexual reproduction	Occurs in a sexual reproduction

Many candidates performed poorly in question 4(c) on the paternity of woman's child. Most
candidates cou1d not write the genotype of the parents namely AA and AO. They wrote Aa
instead of AO. They would not do the crossing. Many candidates stated that Mr. James was
not the father of the child but could not give reasons for their conclusion .

Expected answers were as follows:
		WOMAN		x	MAN
Blood group		A			A
Phenotypes
Genotype		AO		x	AA
Gametes:		A	0	A		A
					.