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Multiple Choice Feedback Quiz
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1

Mendel chose to work with garden pea plants because
A)they are small and easy to grow
B)they produce large numbers of offspring and mature quickly
C)the reproductive organs of the pea are enclosed within the flower and are self-pollinating
D)all of the above
2

In Mendel's experiment, a cross of a heterozygous purple-flowered plant (Ww) with a homozygous white-flowered plant (ww) will produce
A)25% white-flowered offspring.
B)100% purple-flowered offspring.
C)50% homozygous purple-flowered offspring.
D)50% heterozygous purple-flowered offspring.
3

In a dihybrid cross of a round, yellow pea that is heterozygous for both factors, with a wrinkled, yellow pea that is homozygous for the wrinkled factor and heterozygous for the color factor, we can predict
A)there will be no homozygous round peas.
B)half of the peas will be wrinkled.
C)25% of the peas will be green.
D)a, b, and c are correct
4

The condition that results from one allele affecting more than one trait is
A)incomplete dominance.
B)pleiotropy.
C)partial dominance.
D)epistasis.
5

Which one of the following statements is not true about meiosis?
A)Meiosis occurs in reproductive cells.
B)Meiosis results in four haploid daughter cells.
C)In meiosis, homologous pairs of chromosomes are pulled apart.
D)Meiosis occurs only in animals.
6

Crossing over occurs during
A)prophase I:
B)prophase II:
C)interphase I:
D)interphase II:
7

Nondisjunction occurs during
A)mitosis.
B)meiosis I.
C)meiosis II.
D)both b and c.
8

Down syndrome results from
A)the absence of one chromosome in position 21.
B)the presence of an extra chromosome in position 21.
C)the absence of both chromosomes in position 21.
D)crossing over on the chromosomes in position 21.
9

Which of the following is the result of nondisjunction of the sex chromosomes?
A)Down syndrome
B)Barr body
C)Turner syndrome
D)Phenylketonuria
10

Which one of the following genetic disorders is carried by a dominant allele?
A)Huntington's disease
B)Sickle-cell anemia
C)Tay-Sachs disease
D)Hemophilia
11

Males who inherit a XXY combination due to nondisjunction have the condition called
A)Down syndrome
B)Klinefelter syndrome
C)Turner syndrome
D)hemophilia
12

Mendel called the factors that determined the inherited characteristics "genes."
A)true
B)false
13

Phenotype describes the actual alleles received from both parents.
A)true
B)false
14

A chromosome is a single strand of DNA in a compact formation.
A)true
B)false
15

Sperm and egg cells have a diploid number of chromosomes.
A)true
B)false
16

Accidental changes in genes are called mutations.
A)true
B)false
17

Since hemophilia is a recessive allele, this condition will not show up in individuals carrying just one allele with this trait.
A)true
B)false
18

A picture of an individual's particular array of chromosomes is called a pedigree.
A)true
B)false
19

Individuals who are heterozygous for sickle-cell anemia receive a benefit by not being as susceptible to malaria.
A)true
B)false





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