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Primavera Biology B. Unit 3 exam Questions and Answers Fully Solved
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Primavera Biology B. Unit 3 exam
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Primavera Biology B. Unit 3 examIn pea plants, red flowers and round pollen are known to be recessive traits. In a
dihybrid cross experiment, lots of plants with red flowers and round pollen are found in
the F2 generation. How is this possible? - answer The genes for flower color and pollen
shape are linked.
A Punnett square incorrectly predicts the outcome of a dihybrid cross. There are four
phenotypes in the F2 offspring, but not in the expected ratios. Why? - answer The
genes are partially linked.
If two genes show nearly 100 percent linkage, what does that tell us?
Select all that apply. - answer The two genes are located very close to each other.
The two genes are on the same chromosome.
The two genes are always inherited together.
Which of the following are important uses of genetic maps?
Select all that apply. - answer studying evolution
locating genes that cause disease
Which type of enzyme repairs nicks or breaks along the DNA backbone? - answerDNA
ligase
A biologist wishes to take a useful gene found in penguins and introduce it into some
bacterial cells. Her experimental procedure is given below.
1. Use a restriction enzyme to cut a gene out of the penguin DNA.
2. Use a restriction enzyme to cut open a plasmid.
3. Treat the plasmid with DNA ligase.
4. Treat the plasmid with DNA polymerase.
5. Introduce the plasmid into bacterial cells.
A step is missing. Where should it go in this procedure? - answer"Mix the desired gene
and plasmid together" should go between steps 2 and 3.
Why are DNA primers an important ingredient in a PCR reaction? - answerDNA
polymerase cannot start to copy a DNA molecule without a double-stranded starting
point.
Primers create a double-stranded section of DNA.
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