1. A homozygous red-eyed female Drosophila mates with a red-eyed male Drosophila. What proportion of the female offspring will have white eyes?
75%
25%
100%
0%
2.Red-green colorblindness is a recessive X-linked trait. If a female is red-green colorblind, which of the following is TRUE?
Her father must be colorblind.
Both her parents are carriers of the recessive allele.
Both her parents must be colorblind.
Her mother must be colorblind.
Women cannot exhibit red-green colorblindness because they have two X chromosomes.
3.Alleles are
recessive traits.
dominant traits.
exact copies of the same trait.
alternate versions of the same trait
4.Using three bases to represent each amino acid in a polypeptide
ensures that other organisms can read the code too.
prevents the wrong amino acid from being incorporated into a protein.
ensures that DNA can replicate properly.
ensures that all amino acids are represented at least once by the code.
5. If an organism's DNA contains 20% adenine nucleotides, what percentage of its DNA is composed of guanine nucleotides?
15%
10%
30%
40%
6. A true-breeding tall pea plant is crossed with a tall pea plant of unknown parentage. Which of the following is correct?
Some short individuals may appear in the F2 generation.
Some of the F1 generation will be short.
All of the offspring (F1) will be short.
Over several generations, no short individuals will appear.
7.Morgan breeds and sells snakes. He knows that he can make the most money by breeding and selling albino snakes. Albinism is a recessive trait. His female albino corn snake just produced 6 offspring. Two displayed normal coloration and 4 were albino. What do you know about the genotype of the father?
He could be either heterozygous or homozygous dominant.
He must be homozygous recessive.
There is not enough information to determine the father's genotype.
He must be heterozygous.
8.During the elongation cycle of translation, the A site on a ribosome functions in
releasing the completed polypeptide.
holding a polypeptide as amino acids are added.
attaching the small subunits of rRNA to the large subunit.
receiving a new tRNA with the correct amino acid.
9.Which of the following is an incorrect match?
translation - polypeptide formation
transcription - tRNA formation
translation - mRNA binding to rRNA
replication - copying of DNA
10. The three steps that are required for DNA replication are
base doubling, unwinding, and joining.
unwinding, base doubling, and base pairing.
unwinding, complementary base pairing, and joining.
unwinding, transcription, and translation.
11.The x-ray diffraction pattern of DNA discovered by Rosalind Franklin showed that DNA
contains alpha helices and beta sheets.
contains beta sheets arranged in a repeated pattern.
has a repeated pattern.
is both helical and has a repeated pattern.
12. Which of the following is TRUE?
All traits on the sex chromosomes are associated with sexual development.
Females can be heterozygous for sex-linked traits.
Males are heterozygous for the SRY gene.
Men pass their X-linked traits to their sons.
13. Martha has a widow's peak and attached earlobes. Martha's dad had a straight hairline and unattached earlobes. What is Martha's genotype?
Wwee
WwEE
wwee
WWEE