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Bio 156 Quiz 4 - Chapters 20-22


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Nondisjunction is a kind of chromosome mutation where
A. only female chromosomes fail to separate during the formation of the egg
B. one or more pairs of homologous chromosomes fail to separate during meiosis
C. a piece of one chromosome
Solve this monohybrid genetics problem: Black hair is governed by the dominant gene (B) and blond hair is determined by the recessive gene (b). In this monohybrid cross, if both parents are heterozygous, what percent of the offspring would be expected to
An organism with genotype AaBb would be described as being
A. heterozygous
B. homozygous dominant
C. heterozygous dominant
D. homozygous recessive
Rosalind Franklin's research contribution was essential in_________.
A. establishing that DNA was the hereditary material of life
B. establishing the principle of base pairing
C. establishing that the DNA molecule is a helix
D. seque
Replication of DNA is said to be "semiconservative" because___________.
A. each separated strand serves as a template to make an exact copy
B. fragments of each strand code for the formation of a new strand
C. the whole DNA mole
James Watson and Francis Crick_____________.
A. established the double-stranded nature of DNA
B. confirmed the principle of base pairing
C. explained how DNA's structure permitted it to be replicated
D. proposed the concept of the do
Assume that tall (D) is dominant to dwarf (d). If two homozygous varieties, DD and dd, are crossed, what kind of progeny will be produced?
A. All intermediate forms
B. All tall
C. All dwarf
D. 1/2 tall, 1/2 dwarf
In the bonding of nitrogenous bases,___________.
A. adenine is paired with cytosine
B. adenine is paired with guanine
C. cytosine is paired with thymine
D. guanine is paired with cytosine
Assume that short hair (L) is dominant to long hair (l). If a short-haired parent of unknown origin is crossed with a long-haired parent and they produce one long-haired and one short-haired offspring, this would tell you that
A. the short-haired a
In the comparison between a spiral staircase and a DNA molecule, the steps would correspond to___________.
A. sugars
B. hydrogen bonds
C. base pairs
D. nucleotides
E. phosphates
Each DNA strand has a backbone that consists if alternating______________.
A. purines and pyrimidines
B. nitrogen-containing bases
C. hydrogen bonds
D. sugar and phosphate molecules
E. amines and purines
Replication of DNA____________.
A. produces RNA molecules
B. produces only new DNA
C. produces two molecules, each of which is half-new and half-old DNA joined lengthwise to each other
D. generates excessive DNA, which eventually cau
Which of the following is the BEST description of Mendel's principle of independent assortment?
A. One allele is always dominant to another
B. Hereditary units from the male and female parents are blended in the offspring so that the offspring
DNA polymerase_____________.
A. is an enzyme
B. adds new nucleotides to a strand
C. proofreads DNA strands to see that they are correct
D. derives energy from ATP for synthesis of DNA strands
E. All of these
Work out a Punnett-square for the following dihybrid genetics problem. In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s). If two heterozygous parents (Bb Ss) were crossed, what fraction of
If both parents in a dihybrid cross are heterozygous for both traits, the expected phenotypic ratio in the offspring would be
A. 1:1
B. 2:1
C. 9:3:3:1
D. 1:2:1
________ molecules carry protein-assembly instructions from the nucleus to the cytoplasm.
A. Template DNA
B. Messenger RNA
C. Transfer RNA
D. Ribosomal RNA
E. enzyme
Solve the following "multiple allele" problem from the information in the on-line lesson. Susan, a mother with Type B blood, has a child with Type O blood. She claims that Craig, who has Type A blood, is the father. He claims that he cannot pos
The RNA molecule is made up of how many strands?
A. 1
B. 2
C. 3
D. 6
E. 12
The nitrogenous base found in DNA but not in RNA is_________.
A. adenine
B. cytosine
C. guanine
D. uracil
E. thymine
The parents of a child with Type AB blood
A. can have different blood types, but neither can be blood Type O
B. must be A and B but not AB
C. must both be AB
D. can be any blood type
The synthesis of an RNA molecule from a DNA template strand is____________.
A. replication
B. translation
C. transcription
D. DNA synthesis
E. metabolism
Which of the following is NOT true of sex chromosomes?
A. The sex chromosomes determine the gender of the child
B. Sex chromosome patterns vary from one sex to another
C. The sex chromosomes only carry genes that have to do with sex chara
Before leaving the nucleus, the RNA molecule____________.
A. acquires a poly-A tail
B. breaks loose from the terminator signal on the template
C. becomes capped
is stripped of its introns
D. All of these
If parents had a karyotype diagram of their baby's chromosome pattern, they, and their doctor would be able to us this information in
A. detecting and reducing mutagenic agents
B. finding out which parent has contributed each dominant characte
If the DNA triplets were ATG-CGT, the mRNA codons would be____________.
E. none of these
If the DNA triplets were ATG-CGT, the tRNA anticodons would be_____________.
E. none of these
The probability of producing a normal child by two parents who are both carriers for an autosomal recessive disorder (they are both heterozygous) is
A. 75 percent
B. 0 percent
C. 100 percent
D. 25 percent
Males express recessive sex-linked traits more often than females because
A. males have two X chromosomes and females have only one
B. males have only one X chromosome where females have two
C. both males and females have an X and a Y but
A chromosome that has been broken and rejoined in a reversal sequence has undergone which of the following mutations?
A. Inversion
B. Deletion
C. Duplication
D. Translocation

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