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