Which of the following statements about sickle cell anaemia is correct?
it is caused by sex-linked genes
it is more common in males than in females
two sickle cell carrier parents may have a sickling child
it is caused by recessive genes
Correct answer is C
No explanation has been provided for this answer.
Plants suitable for experiments in genetics must not
produce numerous seeds within a short time
have a small number of chromosomes
have a relatively short life cycle
produce one generation in a large period
Correct answer is D
No explanation has been provided for this answer.
A mixture of blood with antigen A and blood containing antibody A will
lead to agglutination
facilitate dissolution of clot
have no effect on blood composition
change the blood group
Correct answer is A
No explanation has been provided for this answer.
Which of the following statements about mitosis is not correct?
chiasmata are not formed
Bivalents are not formed
It does not lead to variation
Four daughter cells are produced
Correct answer is D
No explanation has been provided for this answer.
The diagrams below are illustrations of types of comb found in domestic fowl. Study them and answer this question.
Which factor is most likely responsible for the various types of comb?
environment
genetics
physiology
morphology
Correct answer is B
No explanation has been provided for this answer.
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