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Multiple Choice
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1

The first person to systematically study genetics was
A)Darwin.
B)Mendel.
C)Lyell.
D)Lamarck.
2

A gene's location on a chromosome is its
A)gamete.
B)meiosis.
C)locus.
D)allele.
3

Which of the following pairs is incorrect?
A)diploid: gamete
B)haploid: n
C)meiosis: sex cells
D)chromosome: locus
4

With regard to the genetically control of ear lobe shape, an individual with the genotype ee
A)is heterozygous.
B)has two attached earlobes.
C)has free earlobes.
D)is homozygous dominant.
5

The allele for attached earlobes is ______ to the allele for free earlobes.
A)dominant
B)codominant
C)recessive
D)pleiotropic
6

Sickle-cell anemia is an example of a _____ trait.
A)recessive
B)dominant
C)codominant
D)sex linked
7

Males show higher frequencies of _____ traits than females.
A)recessive X-linked
B)codominant
C)dominant
D)recessive
8

"Pure line" pea plants are always _____ for a given trait.
A)recessive
B)dominant
C)heterozygous
D)homozygous
9

This gene controls the differentiation of the embryonic gonad to a male testis.
A)ABC gene
B)GM gene
C)achondroplasia gene
D)SRY gene
10

Mendel's___________ states that when gametes are formed by a diploid organism, the alleles that control a trait separate from one another into different gametes, retaining their individuality.
A)law of dominance
B)law of segregation
C)law of independent assortment
D)law of genetic abnormality
11

This tool is a box figure that allows you to determine the probability of genotypes and phenotypes of the progeny of a particular cross.
A)Punnett square
B)PCR
C)controlled cross
D)inbreeding
12

A trait determined by alleles at multiple loci is an example of
A)codominance.
B)dominance.
C)multiple alleles.
D)polygenic inheritance.
13

Which of the following is not a polygenic trait in humans?
A)height
B)skin color
C)blood type
D)eye color
14

If one gene affects multiple phenotypes, it is said to be
A)recessive.
B)pleiotropic.
C)dominant.
D)codominant.
15

Which of the following bases is not found in DNA?
A)thymine
B)cytosine
C)guanine
D)uracil
16

Which of the following base pairings is incorrect?
A)G-C
B)A-T
C)G-U
D)U-A
17

There are three different forms of RN Which is not one of these?
A)mitochondrial
B)messenger
C)transfer
D)ribosomal
18

Which of the following pairs is mismatched?
A)DNA replication: DNA polymerase
B)translation: tRNA
C)translation: rRNA
D)DNA replication: amino acids
19

When a gene is transcribed into RNA, the duplex double-stranded DNA is "unzipped," and an enzyme known as ________ attaches to the DNA at the promoter region.
A)DNA polymerase
B)RNA polymerase
C)helicase
D)unzipperase
20

"Mature" mRNA does not contain
A)exons.
B)introns.
C)uracil.
D)guanine.
21

How many common amino acids are used in protein synthesis?
A)14
B)20
C)30
D)64
22

Splicing genes from one organism to another is known as
A)transposons.
B)jumping genes.
C)DNA transcription.
D)DNA recombination.
23

Which molecule has a cloverleaf shape due to hydrogen bonds in its structure?
A)tRNA
B)DNA polymerase
C)mRNA
D)RNA polymerase
24

Which of the following statements about DNA replication is incorrect?
A)Bases are "proofread" by enzymes after addition.
B)One DNA strand is copied first, then the other.
C)Nucleotides are attached by the enzyme DNA polymerase.
D)Complementary bases are added to the exposed strand to create the "copy" strand.
25

Enzymes are involved in
A)DNA replication.
B)transcription.
C)translation.
D)All of the above.





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