Question

1. Which two alleles a person has for a particular trait is their: _______________________

2. A person’s observable trait as a result of which alleles they have is their: ____________________

3. Some traits are controlled by many genes, such as height. Such traits are called

_________________________________________

4. When an organism has two identical alleles at a particular locus, we say their

genotype is: ___________________________

5. If two different alleles are expressed in the phenotype equally and distinctly, such as the A and

B blood groups, we call these alleles: __________________________

6. A couple is going to have children, and one of them has freckles and the other has no freckles. We know their genotypes are FF and ff. Set up a Punnett square.

F = freckles

f = no freckles

Freckles is dominant over no freckles

7. In the above cross, what are the chances that this couple will have a baby with freckles?

_______________

8. Von Willebrand disease is a recessive blood clotting disorder, heterozygotes are phenotypically normal. There is no test available to distinguish carriers. Two people are going to start a family, both of whom have a full sibling with Von Willebrand disease. What are the odds that each of them individually is a carrier? Keep in mind, we already know these two do not have the disease.

9. Why are most of the colorblind humans males? (use chromosomes to explain)

_______________________________________________________________________________

_______________________________________________________________________________

10. Name a human disease syndrome caused by aneuploidy (not cancer): _______________________

Answer 1