1. Phenotypes is:

your genetic make up
represented by two alleles
given by words such as homozygous and heterozygous
your physical characteristics
determines genotype

2. How many alleles are there for human blood type?

1
2
3
4
5

3. A person homozygous recessive may have straight hair; a homozygous dominant curly hair, and a heterozygote wavy hair. What is the interaction between these alleles?

dominant / recessive
co-dominant
incompletely dominant
additive
penetrance

4. A person with the phenotype of being AB for blood type has the genotype AB. What is the relationship between the A allele and B allele?

dominant / recessive
co-dominant
incompletely dominant
additive
penetrance

5. Alleles seggregate independently of other alleles because:

maternal and paternal chromosomes line up randomly on either side of the equator during metaphase I
crossing over during prophase I
cytokinesis
separation of sister chromatids during anaphase I
a and b

6. A homozygous dominant male with cleft chin (AA) and bushy eyebrows (aa) has children with a women who is heterozygous for both traits. What would be the expected phenotypic ratio of their children for these traits?

50% cleft chin with bushy eyebrows; 50% cleft chin with fine eyebrows
100% cleft chin with bushy eyebrows
50% cleft chin with bushy eyebrows; 50% with out cleft with fine eyebrows
25% cleft chin with bushy eyebrows; 75% cleft chin with fine eyebrows
9 (dominant both traits): 3 (dominant first trait; recessive second): 3 (recessive first trait; dominant second): 1 (recessive both traits)

7. What human population is most subject to Tay-Sachs disease?

American Indian
African American
European American
Jewish
Oriental

8. A person with AB blood type mates with someone with BO blood type. Which of the following is not a possible phenotype for their offspring?

A
B
AB
O
all of these are possible

9. Certain types of muscular dystrophy are sex-linked. If a women is a carrier for the disease, and the father has the disease, what is the probability their children will get the disease?

50% for boys and 50% for girls
50% for boys and 0% for girls
100% for boys and 50% for girls
100% for boys and 0% for girls
100% for boys and girls

10. Perform a dihybrid cross for two individuals. The male has normal blood clotting, but the female is a heterozygote for hemophilia (sex-linked. Both male and female are heterozygous for nose size (incompletely dominant). Which of the following is the correct ratio for the females: normal with large nose : carrier with large nose ; normal with medium nose : carrier with medium nose : normal with small nose : carrier with small nose

16:8:8:4:4:1
9:3:3:3:3:1
1:1:2:2:1:1
1:2:1:2:1:2
1:4:8:16:8:4:1