Question 1. Albinism is a recessive disorder in which the skin and hair fail to produce pigment. The following questions ask you to evaluate the following pedigree chart in which "N" is the allele for normal pigmentation and "n" is the allele for albinism. The shaded circles for Deirdre and Shannon represent the only individuals expressing the disorder.
What is Geoff's allele combination?
NN
Nn
nn
Cannot be determined
Question 2. Assuming complete dominance, what is the expected genotypic ratio of the offspring following the cross of two heterozygotes?
1:1
1:2:1
3:1
4:1
Question 3. How many chromosomes would be found in the karyotype of a Down syndrome female who also suffered from Turner syndrome?
47
46
45
44
Question 4. In a dihybrid cross involving two autosomal traits on different chromosomes in which the parentals are purebred for the opposite forms of both traits, how many of the offspring would be expected to be homozygous recessive for both traits?
6 out of 16
9 out of 16
3 out of 16
1 out of 16
Question 5. Is an individual with the XXY combination of chromosomes anatomically male or female?
Male
Female
Question 6. The tall allele is dominant and the dwarf allele is recessive. What is the abbreviation for the dwarf allele?
t
T
d
D
Question 7. What is the gender of the person indicated in the photograph?
Female
Male
Cannot be determined
Question 8. What is the name of the syndrome that produces the XXY combination of sex chromosomes?
Turner syndrome
Down syndrome
Klinefelter syndrome
Jacob's syndrome
Question 9. What leads to an individual having too many or two few chromosomes?
Homologous recombination
Nondisjunction
Crossing over
Independent assortment
Question 10. When I say a flower is "purple," what have I described?
Its genotype
Its haplotype
Its phenotype
Its karyotype