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Genetics Chapter 3

front 1

Which of the following groups of scientists were influential around the year 1900 in setting the stage for our present understanding of transmission genetics?
A) Beadle, Tatum, Lederberg
B) Watson, Crick, Wilkins, Franklin
C) deVries, Correns, Tschermak, Sutton, Boveri
D) Darwin, Mendel, Lamarck
E) Hippocrates, Aristotle, Kolreuter

back 1

C) deVries, Correns, Tschermak, Sutton, Boveri

front 2

Name the single individual whose work in the mid-1800s contributed to our understanding of the particulate nature of inheritance as well as the basic genetic transmission patterns. With what organism did this person work?
A) Gregor Mendel; Pisum sativum
B) George Beadle; Neurospora
C) Thomas Hunt Morgan; Drosophila
D) Calvin Bridges; Drosophila

E) Boris Ephrussi; Ephestia

back 2

A) Gregor Mendel; Pisum sativum

front 3

A recessive allele in tigers causes the white tiger. If two normally pigmented tigers are mated and produce a white offspring, what percentage of their remaining offspring would be expected to have normal pigmentation?
A) 25%
B) 50%
C) about 66%
D) 75%
E) about 90%

back 3

D) 75%

front 4

Polydactyly is expressed when an individual has extra fingers and/or toes. Assume that a man with six fingers on each hand and six toes on each foot marries a woman with a normal number of digits. Having extra digits is caused by a dominant allele. The couple has a son with normal hands and feet, but the couple's second child has extra digits. What is the probability that their next child will have polydactyly?
A) 1/32
B) 1/8
C) 7/16
D) 1/2
E) 3/4

back 4

D) 1/2

front 5

Tightly curled or wooly hair is caused by a dominant gene in humans. If a heterozygous curly-haired person marries a person with straight hair, what percentage of their offspring would be expected to have straight hair?
A) 25% curly
B) 50% straight
C) 75% curly
D) 100% straight
E) It is impossible to predict the outcome.

back 5

B) 50% straight

front 6

Which types of phenotypic ratios are likely to occur in crosses when dealing with a single gene pair for which all the genotypic combinations are of equal viability?
A) 9:3:3:1, 27:9:9:9:3:3:3:1
B) 1:2:1, 3:1
C) 1:4:6:4:1, 1:1:1:1
D) 12:3:1, 9:7
E) 2:3, 1:2

back 6

B) 1:2:1, 3:1

front 7

Assume that a black guinea pig crossed with an albino guinea pig produced 5 black offspring. When the albino was crossed with a second black guinea pig, 4 black and 3 albino offspring were produced. What genetic explanation would apply to these data?
A) albino = recessive; black = recessive
B) albino = dominant; black = incompletely dominant
C) albino and black = codominant
D) albino = recessive; black = dominant
E) None of the answers listed is correct.

back 7

D) albino = recessive; black = dominant

front 8

The fundamental Mendelian process that involves the separation of contrasting genetic elements at the same locus would be called ________.
A) segregation
B) independent assortment
C) continuous variation
D) discontinuous variation
E) dominance or recessiveness

back 8

A) segregation

front 9

The Chi-square test involves a statistical comparison between measured (observed) and predicted (expected) values. One generally determines degrees of freedom as ________.
A) the number of categories being compared
B) one less than the number of classes being compared
C) one more than the number of classes being compared
D) ten minus the sum of the two categories
E) the sum of the two categories

back 9

B) one less than the number of classes being compared