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Multiple Choice Quiz
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1

Genes
A)Are portions of DNA that determine characteristics.
B)Are located at specific points called loci (sing.=locus).
C)May have different forms known as alleles.
D)All of the above.
2

The set of all genes necessary to specify an organism's complete list of characteristics is known as the
A)Mendelian factor.
B)Genome.
C)Linkage group.
D)None of the above.
3

An organism is homozygous dominant for trait "Q." Which statement is correct?
A)The genotype is QQ; the phenotype is the expression of trait Q.
B)The genotype is qq; the phenotype is the expression of trait Q.
C)The phenotype is QQ; the genotype is the expression of trait Q.
D)The phenotype is qq; the genotype is the expression of trait Q.
4

George and his wife Sue are both heterozygous for trait "F." What are the chances that their child will express trait "F?"
A)1 chance in 4
B)2 chances in 4 (or 1 in 2)
C)3 chances in 4
D)The child will express this trait.
5

A red flower is crossed with a white flower and the progeny is pink. This is an example of
A)Codominance.
B)Recessive override.
C)Dominant override.
D)Carrier incompatibility.
6

Which statement is true about X-linked genes?
A)The male needs two copies of the gene but will express the trait regardless of whether the alleles are dominant or recessive.
B)The male needs two copies of the gene but will express the trait only if both alleles are dominant.
C)The male needs only one copy of the gene and will express the trait regardless of whether the allele is dominant or recessive.
D)The male needs only one copy of the gene but will express the trait only if the allele is dominant.
7

The SRY gene is found on the
A)Autosomes.
B)X chromosome.
C)Y chromosome.
D)Heterosome.
8

Q:Members of one gene pair separate from each other independently of the members of other gene pairs. This is Mendel's law of
A)Segregation.
B)Independent assortment.
C)Dominance.
D)Linkage.
9

Both Cindy and Sam are heterozygous for both freckles and white forelock, both dominant traits. What is the probability that their child will not have freckles and will not have a white forelock?
A)1 chance in 2
B)1 chance in 4
C)1 chance in 8
D)1 chance in 16
10

Promiscuous Patsy (blood type A) has three lovers: Frank (type AB), Louis (type B), and Fred (type O). Patsy has a baby whose blood type is O. Who might be the father?
A)Either Frank or Louis
B)Either Louis or Fred
C)Either Frank or Fred
D)Either Frank or Louis or Fred
11

Polygenic inheritance is very common in determining characteristics that are
A)Qualitative in nature.
B)Quantitative in nature.
C)Primarily hidden.
D)Not in keeping with Mendelian genetics.
12

Pleiotropy is a term used to describe
A)Multiple effects of a single gene.
B)Genetic abnormalities.
C)The inheritance of eye color.
D)None of the above.
13

Abraham Lincoln may have suffered from
A)PKU.
B)Cystic fibrosis.
C)Marfan syndrome.
D)Neurofibromatosis.
14

If a dominant gene is present but not expressed in a population, this situation is referred to as
A)Variable expressivity.
B)Lack of penetrance.
C)Environmental interference.
D)Either a single- or double-factor cross, depending on the traits involved.
15

Mitochondrial inheritance typically involves
A)Maternal mtDNA but not paternal mtDNA.
B)Paternal mtDNA but not maternal mtDNA.
C)Both maternal and paternal mtDNA.
D)Either maternal or paternal mtDNA, but not both at the same time.
16

BbCCDd is the genotype of an organism. How many different types of gametes can this organism produce?
A)1
B)2
C)3
D)4
17

An example of a phenotype is
A)AB type blood.
B)allele for type A and B blood.
C)a sperm with an allele for A blood.
D)lack of iron in the diet causing anemia.
18

Body size is determined by the interaction of numerous alleles. This is an example of
A)autosomes.
B)pleiotropy.
C)single-factor crosses.
D)polygenic inheritance.
19

The probability of guessing the correct answer to this question is
A)four .
B)one fourth.
C)sixteen.
D)1/4 times 1/4.
20

If both parents are heterozygous, the probability that the recessive trait will appear in the offspring is
A)1/2.
B)1/4.
C)3/4.
D)zero.
21

In order for a recessive X-linked trait to appear in a female, she must inherit a recessive allele from
A)neither parent.
B)both parents .
C)her father only.
D)her mother only.
22

It was noticed that in certain flowers, if a flower had red petals they were usually small petals. If the petals were white, pink, or orange they were usually large petals. This could be the result of
A)lack of dominance.
B)pleiotropy.
C)linkage groups.
D)polygenic inheritance.
23

In pea plants, tall plant height (T) dominates dwarf (t). If a plant heterozygous for the height trait is crossed with a dwarf plant, what will be the phenotypic ratios of the offspring?
A)all Tt
B)1/2 Tt, 1/4TT, 1/4tt
C)1/2 tall, 1/2 dwarf
D)3/4 tall, 1/4 dwarf
24

A man with normal color vision marries a woman with normal vision, but who is a carrier for color blindness. The probability that their first child will be color blind is ________ ; the probability that their first daughter will be color blind is ________; and the probability that their first son will be color blind is ________.
A)1/2; 1/2; 1/2
B)1/4; 0; 1/2
C)1/2; 0; 1/2
D)1/4; 1/2; 1/2
25

A woman with blood type O and a man with blood type AB have a child together. What are the possible bloodtypes of this child?
A)AB or O
B)A, B, or O
C)A or B
D)AB, A, B, or O
26

A radish plant that produces round radishes is crossed with a radish plant that produces long radishes. All of the offspring have oval radishes. Radish shape may be inherited by
A)polygenic inheritance.
B)pleiotropy.
C)multiple alleles.
D)lack of dominance.
27

In the following cross, what is the probability that the offspring will exhibit both dominant traits? Aabb X aaBB
A)1/2
B)3/8
C)4/16
D)1
28

She has really long fingers and toes and is exceptionally tall. This is a statement of
A)genotype.
B)phenotype.
C)monohybridization.
D)locus placement.







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