Jamb Biology Past Questions For Year 1994
Question 41
In the gene locus for eye colour in humans, the allele for brown eye is dominant over the allele for blue eyes. If a homozygous brown-eyed girl has a brother with blue eyes, what are the likely phenotypes of there parents'eye colour (Eye colour is not a sex linked trait)
- A. Both parents have blue eyes
- B. Their father has blue eyes and their mother has brown eyes
- C. both parents have brown eyes
- D. Their mother has the blue eyes and their father has the brown eyes
Question 42
People wit sickle-cell anaemia have haemoglobin
- A. S and are homozygous recessive
- B. A and are heterozygous recessive
- C. S and are heterozygous recessive
- D. A and are homozygous recessive
Question 43
The difference and similarities among living things account for
- A. diversity
- B. stability
- C. competition
- D. evolution
Question 44
People who suck petrol with their mouths run the risk of increasing in their blood the concentration of
- A. iron
- B. lead
- C. calcium
- D. magnesium
Question 45
A phenomenon by which an animal goes into a state of dormancy during the dry season is called
- A. hibernation
- B. aestivation
- C. incubation
- D. deactivation
