Biology (Mader), 10th Edition

Chapter 11: Mendelian Patterns of Inheritance

Post-Test

1
When an organism has two different alleles at a gene locus, it is referred to as _____.
A)homozygous recessive
B)homozygous dominant
C)heterozygous
2
Which of the following was discovered by Mendel?
A)Linkage
B)Relationship of genetic behavior to laws of probability
C)The location of genes on chromosomes
D)Role of chromosomes in sex determination
3
The word __________ refers to the alleles an individual receives at fertilization.
A)genotype
B)phenotype
C)karyotype
D)lenotype
4
Which of the following is a phenotype?
A)Tt
B)Heterozygous
C)Short
D)T
5
Each gamete has only one allele for each trait because gametes are always _____.
A)haploid
B)diploid
C)triploid
6
Which of the following represents a heterozygous genotype?
A)TT
B)Tt
C)tt
D)tall
7
More phenotypes than expected may result from polygenic inheritance because of _____.
A)multiple alleles
B)codominance
C)environmental effects
D)pleiotropy
8
When individuals make an abnormal form of the extracellular matrix protein, fibrillin, which affects many other traits, the inheritance is the result of ______.
A)codominance
B)multiple alleles
C)simple dominance
D)pleiotropy
9
Blood type in humans is controlled by _____ allele(s).
A)one
B)two
C)three
D)four
10
A man who is color blind has children with a woman who is neither color blind nor a carrier. What are the odds their sons may be color blind?
A)25%
B)0%
C)50%
D)100%
11
The appearance of both A and B types of glycoproteins on the red blood cells of the people with AB blood type is an example of _______.
A)codominance
B)polygenic inheritance
C)autosomal recessiveness
D)incomplete dominance
12
If the allele for red petals is not completely dominant to the allele for white petals, when a true-breeding plant with red petals is crossed with a true breeding plant with white petals, the offspring will ____.
A)all have red petals
B)all have pink petals
C)all have white petals
D)all have red and white petals
13
If a man with blood type A has a child with blood type O, the father's genotype must be _____.
A)AA
B)AB
C)AO
D)OO
14
Which of the following characterizes autosomal recessive disorders?
A)Heterozygotes with normal phenotypes
B)Affected parents always having affected children
C)Affected individuals with homozygous dominant mates having unaffected children
D)All of the above
15
Which of the following is characteristic of an X-linked recessive disorder?
A)Most affected children do not have affected parents.
B)Heterozygotes have a normal phenotype.
C)Two affected parents can have an unaffected child.
D)Males are not affected more often than females.
16
When Mendel crossed a true-breeding tall plant with a true-breeding short plant, the offspring were _____.
A)100% tall
B)50% tall, 50% short
C)100% medium
17
If an individual with the dominant phenotype is crossed with an individual with the recessive phenotype and all the offspring have the dominant phenotype, it would be concluded that the individual with the dominant phenotype is _____.
A)homozygous dominant
B)heterozygous
C)homozygous recessive
18
E = unattached earlobes. e = attached earlobes. In the cross of Ee and Ee, the chance of a child with unattached earlobes is _____.
A)1/2
B)1/4
C)3/4
19
If two flies heterozygous for wing length and body color are crossed, which of the following are possible results?
A)chance of L, long wings = 3/4
B)chance of l, short wings = 1/2
C)Chance of G, grey body = 1/4
D)All of these are true.
20
If the parents are heterozygous for cystic fibrosis (Ff x Ff), then each offspring has a _____ chance of having cystic fibrosis.
A)2%
B)25%
C)50%
D)75%
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