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WorksheetsUnit 6 - DNA and Genetics Review
Total questions: 18
Worksheet time: 9mins
In humans, attached earlobes (e) is due to a recessive trait and detached earlobes (E) is the dominant trait. What percentage of the offspring of a heterozygous female and a homozygous male would be expected to have detached earlobes?
Refer to the codon chart. The mRNA sequence has the code CAG. It is most likely to bond with a tRNA that has which amino acid?
Stop
Met
Val
Gly
Skin color in humans is a polygenic inheritance system. A woman with the genotype aabbcc mates with a man who is AABBCC what would the offspring genotype look like?
A DNA strand has the following bases: CGT ACG. What are the bases on the complimentary strand?
What is the name of this process: mRNA to tRNA to protein.
Widow's peak (W) is dominant to no widow's peak (w). A woman who is heterozygous for a widow's peak marries a man who does not have a widows peak. What is the probable genotypic ratio of the offspring?
100% Ww : 0% ww
25% Ww : 75% ww
75% Ww : 25% ww
50% Ww : 50% ww
What did the original DNA sequence look like that produced a mRNA strand with the sequence UGC AUU?
DNA replication is a semiconservative process because one half of the new strand is the parental strand.
True
False
Sickle cell anemia is a recessive trait. If a woman who is homozygous dominant (not affected) marries a man who has sickle cell anemia, what would be true about the offspring's genotype?
A genotype that is different from both parents
The same genotype as both parents
A phenotype that was different from the parents
The genotype of one of the parents
What are the genotypes of the parents (generation 1) in the pedigree?
Dad is homozygous recessive
Mom is homozygous dominant
Both are heterozygous
Both are homozygous recessive
Dad is homozygous dominant
Mom is homozygous recessive
A student crossed a red snapdragon with a white snapdragon and all the resulting offspring were pink. Which of the following describes this type of inheritance?
Proteins are formed in the cytoplasm using genetic instructions from the DNA in the nucleus. How does the genetic information get to the site of protein synthesis?
mRNA traveled from the nucleus to the cytoplasm
tRNA traveled from the nucleus to the cytoplasm
DNA is divided and sent out to the cytoplasm
rRNA is transcribed from the DNA and binds with mRNA to make proteins
Which of the following best describes the concept of a genetic mutation?
Colorblindness is a sex-linked trait in humans (recessive trait). If a father and son are both colorblind and the mother is normal, what is the genotype of the mother?
X^C X^c
X^c X^c
X^C X^C
X^C Y
The diagram shows a pedigree for a recessive disorder. What is the genotype of individual 8?
X^H X^h
X^h X^h
X^H Y
X^h Y
Which of the following indicates that all organisms can be traced back to a common ancestry?
Almost all genes in microorganisms, plants, and animals have the same codons
Which of Mendel's laws best explains why genetic variation occurs in offspring?
Law of Independent Assortment
Law of Segregation
Law of Crossing Over
Law of Meiosis
If an error occurs during transcription but the change still codes for the same codons as before, would there be any change in the phenotype?
Yes
No
