1. The hereditary units in cells are called: A genes B genetics C characteristics 2. How many chromosomes are contained in one human body cell? A 50 B 46 C 23 3. How many chromosomes are contained in one egg or one sperm? A 2 B 23 C 46 4. The human sex chromosomes are: A XX B XYY C XY 5. In a pedigree, what shape indicates males with the characteristic being studied? A shaded circle B unshaded circle C shaded square 6. An example of a genotype is: A Bb B purebred brown eyes C hybrid blue eye colour 7. When one characteristic is more strongly inherited than another characteristic, it is said to be: A monohybrid B recessive C dominant 8. If a purebred brown-eyed man marries a purebred blue-eyed woman, what colour is most likely for their children's eye colour? A blue B brown C half and half 9. If both parents are hybrid for brown eye colour, the ratios of eye colours of their possible offspring are: Aall blue B3 brown : 1 blue C1 brown : 2 blue 10. In pea plants, tallness is dominant to dwarfness. What are the possible offspring of a hybrid tall plant and a dwarf plant? Ahalf tall and half dwarf Ball tall C3⁄4 tall and 1⁄4 dwarf 11. In fruit flies, straight wing is dominant over curly wing. What are the possible offspring of a homozygous or purebred straight winged fly and a curly winged fly? A half straight winged and half curly winged B all straight winged C insufficient information given 12. Albinism in humans is caused by a recessive allele. A normal couple has 4 children - 3 normal and 1 albino. What are the genotypes of the parents? A only one parent carries the albino allele B one parent is purebred for albinism and the other parent is hybrid C both hybrid for albinism

QUIZ: GENETICS

13. With reference to the question above, what is the chance that the next child will be albino? A1⁄4 B50% Cnearly 100% 14. In cats, short hair is dominant over long hair. What is the ratio of possible offspring if a heterozygous or hybrid short-haired cat mates with a long-haired cat? A half and half B all long-haired C 1short-haired : 1 long-haired 15. In chickens, black eye colour is dominant to blue eye colour. If a purebred black-eyed rooster mated with a purebred blue-eyed hen, what is most likely for the next generation's eye colour characteristics? A all blue-eyed B all black-eyed C insufficient information given