Biology 313 – Exam I  ANSWERS
February 6, 2008
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Choose ONE alternative to BEST complete the statement or answer the question.
1.
What types of phenotypic ratios are most likely to occur in crosses when dealing with
a single gene pair?
a. 3:1, 1:1, 1:2:1
b. 1:1:1:1, 1:4:6:4:1
c. 9:7, 12:3:1
d. 9:3:3:1, 1:2:1
e. 15:1, 1:2
2.
A whiteeyed
Drosophila
female is crossed with a redeyed
Drosophila
male. There
are 60 progeny, of which 40 are whiteeyed males and 20 are redeyed females.
You
use chisquare analysis to test if these results differ from what is expected. Which of the
following statements is true:
a. chisquared = 6.7, pvalue = approx 1%, the data do not differ from
expectations
b. chisquared = 6.7, pvalue = approx 4%, the data differ from expectations
c. chisquared = 2.2, pvalue = approx 35%, the data do not differ from
expectations
d. chisquared = 6.7, pvalue = approx 1%, the data differ from expectations
e. chisquared = 2.2, pvalue = approx 15%, the data do not differ from
expectations
3.
The phenomenon in which more double crossovers occur than are expected for a
region is called
a. chiasma.
b. negative interference.
c. positive interference.
d. synaptonemal complexity.
e. reciprocal genetic exchange.
4.
Ability to roll the tongue is caused by a dominant allele.
A woman is a “roller,” but
We forgot to include a chisquare table for you to consult!!!! Therefore, everyone received
credit for this question. If you left it blank or marked the correct answer or marked an
incorrect answer, no matter what, you received credit.
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View Full Documentone of her parents is not. What is the woman's genotype?
a. homozygous dominant
b. hemizygous
c. homozygous recessive
d. heterozygous
e. cannot be determined from this information
5.
What is the probability that on three flips of a coin, heads will occur on all three flips?
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 Spring '08
 Vollbrecht
 Genetics, RNA, Zygosity, gg x gg, fgh fgh fgh, Neurospora e. T.H. Morgan

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