1. Gregor Mendel developed the principles of inheritance by performing experiments on pea plants. Which statement correctly describes the principle of dominance?
  • A.   Parents contribute equally to the inheritance of offspring
  • B.   Recessive alleles will be masked by dominant alleles
  • C.   Organisms possess two versions of each allele
  • D.   Each gamete contains only one version of an allele
2. Which correctly describes gametes?
  • A.   They are diploid sex cells formed by the process of meiosis
  • B.   They are haploid sex cells formed by the process of meiosis
  • C.   They are diploid sex cells formed by the process of mitosis
  • D.   They are haploid sex cells formed by the process of mitosis
3. DNA mutations can be caused by external factors or be spontaneous. What factor below does not cause damage to the DNA base sequence?
  • A.   Viruses
  • B.   Antioxidants found in food
  • C.   Alkylating agents found in cigarettes
  • D.   X-rays from medical equipment
4. What are all the possible phenotypes of children born to a father with blood group AB and a mother with blood group B?
  • A.   B only
  • B.   AB only
  • C.   AB, A and B
  • D.   AB and B
5. What is the pattern of inheritance in this pedigree?

Autosomal_Dominant_Pedigree_Chart

 GAThrawn22
c.c. BY-SA 3.0
  • A.   Sex linked recessive
  • B.   Sex linked dominant
  • C.   Autosomal recessive
  • D.   Autosomal dominant
6. What contributes to the total DNA content of a zygote?
  • A.   The nucleus of the sperm and the nucleus and mitochondria of an egg
  • B.   The nucleus and mitochondria of the sperm and the nucleus and mitochondria of an egg
  • C.   The nucleus of the sperm and the nucleus of an egg
  • D.   The nucleus and mitochondria of the sperm and the nucleus and of an egg

7.A woman is a carrier of red green colour blindness; her husband does not have colour blindness. What are all the possible outcomes for their children?

  Daughters Sons
A. All normal All normal
B. Half carriers Half affected
C. All carriers All affected
D. Half affected Half affected
8. Which of the following genotypes would represent a male affected by a dominant, sex-linked disease?
  • A.   Xr Y
  • B.   XR Y
  • C.   XR YR
  • D    XR Yr

9. A species of flowering plant can have either red or yellow flowers. The flower colour is controlled by one gene, where red is dominant to yellow. Two heterozygous plants were crossed, what would be the expected observed results?

  Red Flowers Yellow Flowers
A. 60 140
B. 198 2
C. 146 54
D. 98 102
10. A man suffers from Cystic Fibrosis, but his wife does not, however her father had the disease. What is the likelihood of their children suffering from the disease?
  • A.   100 %
  • B.   75 %
  • C.   50 %
  • D    0 %