Q.1
In a recessive condition, such as cystic fibrosis, how many copies of the abnormal allele are needed for the person to be a sufferer?
  • One
  • Three
  • Two
  • Four
Q.2
Sperm cells carry which of the following chromosomes?
  • Just an X chromosome
  • Just a Y chromosome
  • Neither X nor Y chromosomes
  • Either X or Y chromosomes
Q.3
If the genes were Tt, this means that the alleles are...
  • the same
  • identical
  • different
  • increased
Q.4
What are alleles?
  • Different forms of an organism
  • Different forms of an animal
  • Different forms of a gene
  • Different forms of an enzyme
Q.5
Humans have two sex chromosomes. What are the ones in women known as?
  • XY
  • X0
  • XX
  • XXY
Q.6
What is a carrier?
  • A person who has the disease and always passes it on to their offspring
  • A person who is unaffected by the disease but can pass on the gene
  • A person unaffected and incapable of passing on the condition through their genes
  • A person infected who can spread the disease through a droplet infection
Q.7
What offspring ratio would you expect from two parents who are carriers - Tt crossed with Tt?
  • 2:1
  • 3:1
  • 4:1
  • 1:1
Q.8
What is the name of the technique used to test a foetus for genetic disorders?
  • Embryo screening
  • IVF
  • Cloning
  • Stem cells
Q.9
For a condition such as Huntington's disease, how many parents need to be affected for the children to inherit this condition?
  • One
  • Two
  • None
  • Only the grandparents
Q.10
In humans, genes are found in...
  • pairs
  • threes
  • singly
  • fours
0 h : 0 m : 1 s