Bio 200 Exam 3 Review Questions with
Complete Answers
which of the following is not part of Mendel's model of Inheritance?
a. If an allele is present it will be expressed
b. offspring get one allele from each parent
c. parents transmit discrete traits to their offspring
d. traits do not blend
e. traits have alternate forms (alleles) - ANSWER-If an allele is present it will be
expressed
a guinea pig breeder mates a golden-furred mother with a black-furred father, and
the resulting offspring have fur with patches of gold and patches of black. This kind
of inheritance is most likely
a. incomplete dominance
b. epistatasis
c. codominance
d. a continuous trait
e. pleiotropy - ANSWER-codominance
a dihybrid cross between a plant with long smooth leaves and a plant with short hairy
leaves produces a long smooth F1.If this F1 is allowed to self-cross to procedure an
F2, what would you predict for ratio of F2 phenotypes?
a. 1 long hairy: 1 short hairy
b. 9 long smooth: 3 long hairy: 3 short smooth: 1 short hairy
c. 9 short hairy: 3 long hairy: 3 short smooth: 1 long smooth
d. 9 long smooth: 3 long hairy: 3 short hairy: 1 short smooth
e.1 long smooth: 1 long hairy: 1 short smooth: 1 short hairy - ANSWER-9 long
smooth: 3 long hairy: 3 short smooth: 1 long smooth
what is the probability of two AaBb parents producing an offspring that is
heterozygous for at least one gene?
a. 1/4
b. 1/2
c. 1/8
d. 7/8
e. 3/4 - ANSWER-3/4
Nondisjunction occurs when:
a. homologous don't separate in meiosis I
b. chromatids don't separate in meiosis II
c. sections of chromosome are duplicated during DNA replication
d. sections of chromosome are moved to another non-homologue chromosome
e. both a & d - ANSWER-both a & d
, which of the following sex-determine systems is found in birds
a. XO = female, XX = male
b. ZW = female, ZZ = male
c. Diplid = female, Haploid = male
d. XX = female, XO = male
e. ZZ = female, ZW = male
f. XX = female, XY = male - ANSWER-ZW = female, ZZ = male
What cellular process is responsible for genetic recombination
a. crossing over
b. cytokinesis
c. seperation of the homologues in meiosis I
d. seperation of the chromatid in meiosis II
e. Independent assortment - ANSWER-Crossing over
what are Barr bodies
a. X chromosome inactivated in females to prevent overexpression of the alleles
found on the X chromosomes
b. X chromosomes inactivated to allow for expression of male- specific phenotypes
c. Inactivated autosomal chromosomes found only in males
d. Incativated autosomal chromosomes found only in females
e. Highly condensed Y chromosomes in males - ANSWER-X chromosomes
inactivated in females to prevent over expression of the alleles found on the X
chromosomes
The number of map units between two genes on a chromosome is determined by
a. the total number of nucleotides between the genes
b. the number of linked genes within a chromosome
c. the frequency of parental types
d. the recombination frequency
e. the total number of genes within a given piece of DNA - ANSWER-the
recombination frequency
Genes A,B,C,D are located on the same chromosome. The recombination
frequencies (RF) are as follows:
A-B = 10%
A-C = 25%
A-D = 23%
B-C = 15%
C-D = 48 %
What is the most likely order of the genes on the chromosome
a. ABCD
b. BCAD
c. ACBD
d. CBAD - ANSWER-d. CBAD
what is genomic imprinting
a. the development of a phenotype in response to distinct alleles
b. the expression of a dominant allele
Complete Answers
which of the following is not part of Mendel's model of Inheritance?
a. If an allele is present it will be expressed
b. offspring get one allele from each parent
c. parents transmit discrete traits to their offspring
d. traits do not blend
e. traits have alternate forms (alleles) - ANSWER-If an allele is present it will be
expressed
a guinea pig breeder mates a golden-furred mother with a black-furred father, and
the resulting offspring have fur with patches of gold and patches of black. This kind
of inheritance is most likely
a. incomplete dominance
b. epistatasis
c. codominance
d. a continuous trait
e. pleiotropy - ANSWER-codominance
a dihybrid cross between a plant with long smooth leaves and a plant with short hairy
leaves produces a long smooth F1.If this F1 is allowed to self-cross to procedure an
F2, what would you predict for ratio of F2 phenotypes?
a. 1 long hairy: 1 short hairy
b. 9 long smooth: 3 long hairy: 3 short smooth: 1 short hairy
c. 9 short hairy: 3 long hairy: 3 short smooth: 1 long smooth
d. 9 long smooth: 3 long hairy: 3 short hairy: 1 short smooth
e.1 long smooth: 1 long hairy: 1 short smooth: 1 short hairy - ANSWER-9 long
smooth: 3 long hairy: 3 short smooth: 1 long smooth
what is the probability of two AaBb parents producing an offspring that is
heterozygous for at least one gene?
a. 1/4
b. 1/2
c. 1/8
d. 7/8
e. 3/4 - ANSWER-3/4
Nondisjunction occurs when:
a. homologous don't separate in meiosis I
b. chromatids don't separate in meiosis II
c. sections of chromosome are duplicated during DNA replication
d. sections of chromosome are moved to another non-homologue chromosome
e. both a & d - ANSWER-both a & d
, which of the following sex-determine systems is found in birds
a. XO = female, XX = male
b. ZW = female, ZZ = male
c. Diplid = female, Haploid = male
d. XX = female, XO = male
e. ZZ = female, ZW = male
f. XX = female, XY = male - ANSWER-ZW = female, ZZ = male
What cellular process is responsible for genetic recombination
a. crossing over
b. cytokinesis
c. seperation of the homologues in meiosis I
d. seperation of the chromatid in meiosis II
e. Independent assortment - ANSWER-Crossing over
what are Barr bodies
a. X chromosome inactivated in females to prevent overexpression of the alleles
found on the X chromosomes
b. X chromosomes inactivated to allow for expression of male- specific phenotypes
c. Inactivated autosomal chromosomes found only in males
d. Incativated autosomal chromosomes found only in females
e. Highly condensed Y chromosomes in males - ANSWER-X chromosomes
inactivated in females to prevent over expression of the alleles found on the X
chromosomes
The number of map units between two genes on a chromosome is determined by
a. the total number of nucleotides between the genes
b. the number of linked genes within a chromosome
c. the frequency of parental types
d. the recombination frequency
e. the total number of genes within a given piece of DNA - ANSWER-the
recombination frequency
Genes A,B,C,D are located on the same chromosome. The recombination
frequencies (RF) are as follows:
A-B = 10%
A-C = 25%
A-D = 23%
B-C = 15%
C-D = 48 %
What is the most likely order of the genes on the chromosome
a. ABCD
b. BCAD
c. ACBD
d. CBAD - ANSWER-d. CBAD
what is genomic imprinting
a. the development of a phenotype in response to distinct alleles
b. the expression of a dominant allele
