Exam Review
IB204 Mock exam 1
1) 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 fraction of their offspring would be expected to have straight hair?
A) 1/2 straight
B) 1/4 curly
C) 100% straight
D) 3/4 curly
E) It is impossible to predict the outcome.
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 one, 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 above
3) 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.
4) Assume that a cross is made between AaBb and aabb plants and that all the offspring are either AaBb or aabb. These results are consistent with the following circumstance:
A) complete linkage.
B) alternation of generations.
C) codominance.
D) incomplete dominance.
E) hemizygosity.
5) Assume that a cross is made between AaBb and aabb plants and that the offspring occur in the following numbers: 106 AaBb, 48 Aabb, 52 aaBb, 94 aabb. These results are consistent with the following circumstance:
A) sex-linked inheritance with 30% crossing over.
B) linkage with 50% crossing over.
C) linkage with approximately 33 map units between the two gene loci.
D) independent assortment.
E) 100% recombination.
6) With incomplete dominance, a likely ratio resulting from a monohybrid
1) 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 fraction of their offspring would be expected to have straight hair?
A) 1/2 straight
B) 1/4 curly
C) 100% straight
D) 3/4 curly
E) It is impossible to predict the outcome.
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 one, 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 above
3) 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.
4) Assume that a cross is made between AaBb and aabb plants and that all the offspring are either AaBb or aabb. These results are consistent with the following circumstance:
A) complete linkage.
B) alternation of generations.
C) codominance.
D) incomplete dominance.
E) hemizygosity.
5) Assume that a cross is made between AaBb and aabb plants and that the offspring occur in the following numbers: 106 AaBb, 48 Aabb, 52 aaBb, 94 aabb. These results are consistent with the following circumstance:
A) sex-linked inheritance with 30% crossing over.
B) linkage with 50% crossing over.
C) linkage with approximately 33 map units between the two gene loci.
D) independent assortment.
E) 100% recombination.
6) With incomplete dominance, a likely ratio resulting from a monohybrid