Genetics Ch3 Flashcards
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 which organism did this
A) Gregor Mendel; Pisum sativum
B) George Beadle; Neurospora
C) Thomas Hunt Morgan; Drosophila
D) Calvin Bridges; Drosophila
E) Boris Ephrussi; Ephestia
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
C) about 66%
E) about 90%
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
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
B) 50% straight
C) 75% straight
D) 100% straight
E) It is impossible to predict the outcome.
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
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 are correct.
The fundamental Mendelian process that involves the separation of
contrasting genetic elements at the same locus is called ________.
B) independent assortment
C) continuous variation
D) discontinuous variation
E) dominance or recessiveness
Which of the following groups of scientists were influential around
the year 1900 in setting the stage for our present understanding of
A) Beadle, Tatum, Lederberg
B) Watson, Crick, Wilkins, Franklin
C) deVries, Correns, Tschermak, Sutton, Boveri
D) Darwin, Mendel, Lamarck
E) Hippocrates, Aristotle, Kolreuter
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
A gene can have a maximum of two alleles
The nonfunctional form of a gene is called a wild-type allele.
Mendel's discoveries were well received and understood by his contemporaries.
Mendel's postulate of independent assortment is supported by a 1:1:1:1 testcross ratio.
A 9:3:3:1 phenotypic ratio is expected from a dihybrid testcross.
Assuming complete dominance, a 3:1 phenotypic ratio is expected from a monohybrid sib or self-cross
A 1:1 phenotypic ratio is expected from a monohybrid testcross with complete dominance
To test Mendel's Law of Segregation, the experimenter needs a minimum of two contrasting forms of a gene
Mendel's Law of Segregation is supported by a 1:1 testcross ratio.