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?
Ahalf straight winged and half curly winged
Ball straight winged
Cinsufficient information given |
12. Albinism in humans is caused by a recessive allele. A normal couple have 4 children - 3 normal and 1 albino. What are the genotypes of the parents?
Aonly one parent carries the albino allele
Bone parent is purebred for albinism and the other parent is hybrid
Cboth hybrid for albinism |
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?
Ahalf and half
Ball long-haired
C1 short-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?
Aall blue-eyed
Ball black-eyed
Cinsufficient information given |