AP Biology (Mader), 11th 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)The relationship of genetic behavior to laws of probability
C)The location of genes on chromosomes
D)The role of chromosomes in sex determination
3
An organism's actual gene makeup, often designated by letters like Aa or BB, is the ________.
A)genotype
B)phenotype
C)karyotype
D)linotype
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
Which of the following does NOT describe multifactorial traits?
A)Controlled by polygenes
B)May be influenced by genes on many different chromosomes
C)Traits that have nothing to do with gender but are found on the X chromosome
D)Influenced by the environment
8
Individuals producing an abnormal form of the extracellular matrix protein, fibrillin, is a result of ______.
A)codominance
B)multiple alleles
C)simple dominance
D)pleiotropy
9
A person's ABO blood type is controlled by _____ allele(s).
A)one
B)two
C)three
D)four
10
If a man who has red-green color blindness has children with a woman who is neither color blind nor a carrier, what are the odds that their sons may be color blind?
A)25%
B)0%
C)50%
D)100%
11
The appearance of both A and B antigens 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 incompletely 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)IAIA
B)IAIB
C)IAi
D)ii
14
Which of the following statements about autosomal recessive disorders is NOT true?
A)Heterozygotes may have offspring with normal phenotypes.
B)If both parents are affected, their children will always have the trait.
C)Affected individuals with homozygous dominant mates have unaffected children.
D)Two carriers cannot have an affected child.
15
Which of the following statements about X-linked recessive disorders are NOT true?
A)Most affected children do not have affected parents.
B)Heterozygotes have a normal phenotype.
C)Two affected parents will always have affected offspring.
D)Males are not affected more often than females.
16
When Mendel crossed a true-breeding tall plant (T) with a true-breeding short plant (t), 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, one would conclude that the individual with the dominant phenotype has a ________ genotype.
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
A child with the blood type of A may have parents with all the following genotypes EXCEPT:
A)A and B
B)AB and A
C)O and A
D)O and O
20
If 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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