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Lecture 8

BIOL 1201 Lecture Notes - Lecture 8: Zygosity, Mendelian Inheritance, Haemophilia

Biological Sciences
Course Code
BIOL 1201
Bill Wischusen

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1. A man has six fingers on each hand and six toes on each foot. His wife and their daughter
have the normal number of digits. Remember that extra digits is a dominant trait. What
fraction of this couple's children would be expected to have extra digits? Express your
answer using the slash symbol and no spaces (for example, 1/16).
a. ½
2. A black guinea pig crossed with an albino guinea pig produces 12 black offspring. When
the albino is crossed with a second black one, 7 blacks and 5 albinos are obtained. What
is the best explanation for this genetic outcome?
a. Albino (b) is a recessive trait; black (B) is a dominant trait.
3. What are the genotypes of the parents in the first cross (the cross that produced 12 black
a. BB x bb
4. What are the genotypes of the gametes and offspring in the first cross?
a. Gametes: B and b; offspring: all Bb
5. What are the genotypes of the parents in the second cross (the cross that produced 7 black
and 5 albino offspring)?
a. Bb x bb
6. What are the genotypes of the gametes and offspring in the second cross?
a. Gametes: ½ B and ½ b (heterozygous parent) and b; offspring: ½ Bb and ½
7. An individual with the genotype A/A can produce _____ type/s of gametes with respect
to the "A" gene.
a. 1
8. An individual with the following genotype (A/a B/b C/c d/d) could produce all of the
gametes shown below except:
a. A/B/C/D
9. The random distribution, which occurs as different pairs of homologous chromosomes
move into different gametes demonstrates:
a. Independent assortment
10. An individual who is heterozygous for a single gene has how many unique alleles for that
a. 2
11. In a cross between a true breeding red flowered rose and a true breeding white flowered
rose what is the expected phenotypic ratio of the offspring? Assume red flowered is
completely dominant.
a. All red flowered
12. In crossing a homozygous recessive individual with a heterozygous individual, what is
the chance of getting an offspring with the homozygous recessive phenotype?
a. 50%
13. Based on the pedigree shown below the allele for this disorder is recessive.
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