Genetics and Variation
GCE Biology
9 Genetics and Variation practice questions covering everything you need for GCE.
Drill Genetics and Variation →Sample Genetics and Variation questions
In humans, ABO blood grouping is controlled by multiple alleles: IA (for blood group A), IB (for blood group B), and i (for blood group O). IA and IB are both dominant over i, but codominant with each…
(a) Define the following terms as used in genetics: (i) Genotype (ii) Phenotype (iii) Codominance (iv) Test cross (b) In cattle, the gene for red coat (R) is incompletely dominant over the gene for wh…
A woman with normal vision whose father was colour-blind marries a man with normal vision. What is the probability that their son will be colour-blind? (Colour blindness is X-linked recessive)
In a population of 200 guinea pigs, 32 are white-furred. If white fur is controlled by a recessive allele and the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant all…
Which of the following best describes a genotype?
A man with blood group AB marries a woman with blood group O. Which of the following blood groups is IMPOSSIBLE among their children?
In Drosophila, grey body (G) is dominant over black body (g) and long wing (L) is dominant over vestigial wing (l). A dihybrid cross between two flies heterozygous for both traits is performed. If the…
Which of the following is an example of discontinuous variation in humans?
In a monohybrid cross between two heterozygous tall pea plants (Tt × Tt), what is the probability that an offspring will be homozygous recessive?