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BIOL239 Lecture Notes - Pyrimidine Dimer, Vulgate, Homologous Chromosome

Course Code
Christine Dupont

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These are practice questions developed to aid in understanding the
concepts learned in BIOL 139 Genetics. All questions come from past
students, not from the professor or university. As a disclaimer, material
may have also changed since this was created.
1. Mendel’s law of __________________ states that during gamete formation,
different pairs of alleles segregate independently of each other.
a. product
b. sum
c. segregation
d. independent assortment
e. recombination
2. Individuals having two different alleles for a single trait are ____________.
a. monohybrids
b. dihybrids
c. monosomic
d. disomic
e. polyploid
3. Two individuals with the genotype AaBb are crossed, where dominant alleles for
both genes (A and B) are required for pigment production. If they have two
offspring, what is the probability the first will have pigment and the second will
lack pigment ?
a. 0
b. 3/16
c. 9/16
d. 63/256
e. 81/256
4. In a cross between heterozygotes for a particular gene, what ratio in the offspring
is associated with recessive lethality ?
a. 1:2:1
b. 3:1
c. 2:1
d. 1:1
e. 9:7

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5. A method of discovering whether a particular phenotype in two different
individuals arises from mutations in the same or separate genes is through a(n)
______________ test.
a. heterogeneity
b. homogeneity
c. complementation
d. mutation
e. epistasis
6. In karyotypes, homologous pairs of chromosomes are arranged and numbered :
a. starting from most strongly staining to least strongly staining
b. starting from least strongly staining to most strongly staining
c. starting from largest to smallest
d. starting from smallest to largest
e. randomly
7. The stage of the cell cycle just before mitosis is
a. G0
b. G1
c. G2
d. S
e. cytokinesis
8. Which of the following does not occur during mitosis:
a. sister chromatids attach to spindle fibres from opposite poles
b. homologous chromosomes pair along their length
c. centromeres are split
d. centrosomes move apart towards opposite poles
e. all of the above occur during mitosis
9. Duplication of genetic material occurs during
a. interphase but not interkinesis
b. interkinesis but not interphase
c. neither interphase nor interkinesis
d. both interphase and interkinesis

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10. Which of the following is not observed in plant cells:
a. the formation of a cell plate during cytokinesis
b. the formation of microtubules
c. division of centromeres
d. the presence of centrioles or
e. the nuclear envelop
11. If a male fruit fly that is hemizygous for a dominant allele specifying an orange
colored body is mated with a female fly with recessive wild-type body color,
assuming both flies are from true breeding stocks, what phenotypes would be
expected in the resultant offspring ?
a. all flies would have wild-type bodies
b. all flies would have orange bodies
c. females would have wild-type bodies and males would have orange bodies
d. females would have orange bodies and males would have wild-type bodies
e. there would be wild-type and orange bodied flies of both sexes
12. Calculate the chi-square value for the following data set:
Phenotypic class Observed Expected
AB 43 50
ab 55 50
Ab 48 50
aB 54 50
a. 0.36
b. 0.72
c. 1.09
d. 1.88
e. 1.97
13. In the cross vg b+ pr+/vg+ b pr x vg b pr/ vg b pr, where all three genes are linked,
and pr is the middle gene, which phenotypic class would be expected to be the smallest in
the offspring:
a. vg b+ pr
b. vg+ b pr
c. vg+ b+ pr+
d. vg b pr+
e. vg b pr
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