Download 1. The ability to taste PTC, a bitter substance, is a dominant autosomal

BIO102 Genetics Homework 2
F2010
1. The ability to taste PTC, a bitter substance, is a dominant autosomal (not sexlinked) trait. A man who can taste PTC has a mother who cannot taste PTC.
The man’s wife cannot taste the substance. What is the chance that their child
will inherit the ability to taste PTC?
2. The w (white eye) gene is located on the X chromosome in Drosophila. w+
represents the wildtype allele. w is the mutant allele. A white-eyed female is
mated with a red-eyed (wildtype) male. What phenotypes and genotypes are
expected in the offspring?
3. Hemophilia is an X-linked blood clotting disorder, most commonly observed in
males. A normal man has a child with a heterozygous (carrier) woman. What is
the chance of a hemophiliac son? Daughter?
4. Identify the number of Barr bodies in the following human cells
Normal female
Normal male
Turner syndrome female
5. A. Identify the correct scientist for each of the statements.
B. For each statement, explain the significance of the finding with respect to
genetics
1.
2.
3.
4.
Mapped genes on Drosophila chromosomes in the 1920s.
Developed the principle of independent assortment
First identified chromosomes
Named an aneuploid disorder in which 3 chromosome 21 appear in each
of the individual’s cells
5. Named the monosomy 45, X
6. Characterized an inactivated X chromosome in female cells
7. Proposed a hypothesis to explain the Barr body