Bonus Quiz Questions: Exam #4 Flashcards
Helen and Frank are partners who are both carriers for the same recessive genetic disease. They have three children already, none of whom are affected by this genetic disease. If they have another child together, what is the probability that this child will be affected by the disease?
A.) 0%
B.) 25%
C.) 50%
D.) 75%
E.) 100%
B.) 25%
Questions 2 and 3 of Quiz #13, have pictures
2.)C 3.)E
Which of the following is true of dominant traits?
A.) they usually skip generations in human pedigrees
B.) they can only be caused by autosomal genes
C.) they affect males more frequently than females
D.) two unaffected parents should not have any affected offspring
E.) they cannot be analyzed by using pedigrees
D.) two unaffected parents should not have any affected offspring
Genes that exhibit genetic linkage violate which of Mendel’s postulates?
A.) unit factors occur in pairs
B.) Dominace/Recessiveness
C.) Segregation of alleles
D.) Independent Assortment
D.) Independent Assortment
Which of the following genotypes could be used to describe an individual that is heterozygous for two genes that are DIFFERENT chromosomes?
A.) Aa/Bb
B.) A/a; B/b
C.) A;a/B;b
D.) Ab/aB
B.) A/a; B/b
Which of the following genotypes could be used to describe an individual that is heterozygous for two genes that are located on the SAME chromosome?
A.) Aa/Bb
B.) A/a; B/b
C.) A;a/B;b
D.) Ab/aB
D.) Ab/aB
If crossing over never occurred,______
A.) genes on the same chromosomes would never assort independently
B.) genes would never exhibit linkage
C.) 100% of gametes would have a recombinant genotype
D.) meiosis and mitosis would be the same
E.) males would be XX instead of XY
A.) genes on the same chromosomes would never assort independently
Flower color in snapdragons is an example of which genetic phenomenon?
A.) Complete Dominance
B.) Co-Dominance
C.) Incomplete Dominance
D.) X-Linked Inheritance
E.) Gene Linkage
C.) Incomplete Dominance
The A and B blood type alleles in humans are an example of which genetic phenomenon?
A.) Complete Dominance
B.) Co-Dominance
C.) Incomplete Dominance
D.) X-Linked Inheritance
E.) Gene Linkage
B.) Co-Dominance
Consider two people with blood type AB, who are both carriers of the recessive allele for albinism. What is the probability of their first child displaying the albino phenotype and blood type B?
A.) 1/16
B.) 2/16
C.) 3/16
D.) 4/16
E.) 9/16
A.) 1/16
From a cross between two pink snapdragon plants, what proportion of the offspring will have pink flowers?
A.) 100%
B.) 75%
C.) 50%
D.) 25%
E.) 0%
C.) 50%
In recessive epistasis, the recessive phenotype of the ____ gene prevents the phenotypic expression of the _____ gene.
A.) dominant, recessive
B.) recessive, dominant
C.) linked, unlinked
D.) epistatic, hypostatic
E.) hypostatic, epistatic
D.) epistatic, hypostatic
In labrador retrievers, there is recessive epistasis between the E and B genes, both of which influences coat color. From a cross between two dihybrid labs (BbEe). What proportion of the offspring should have yellow coats?
A.) all of the puppies should have yellow coats
B.) 9/16
C.) 3/16
D.) 1/16
E.) 4/16
E.) 4/16
A person with blood type O ____
A.) produces both A and B red blood cell antigens
B.) is homozygous for the recessive i allele
C.) might be homozygous for the dominant i allele
D.) is homozygous for the recessive h allele and lacks the H substance
E.) either B or D are possible for a person with blood type O
E.) either B or D are possible for a person with blood type O
Two loss of function mutations that are allelic to one another ____.
A.) should fail to complement each other in a complementation test
B.) will exhibit recessive epistasis
C.) must affect two different genes
D.) will only produce wild type offspring if homozygous individuals are crossed with each other
E.) all of the above
A.) should fail to complement each other in a complementation test
