Genetics Exam Multiple Choice Questions And Answers
2025
Patterns of Inheritance: dominance and codominance
*** -- Correct Answer --The ABO blood group in humans represents what type(s) of patterns of
inheritance? What are the possible genotypes that determine each of the phenotypes in this
system?
X+ is black
Xo is orange
Males are hemizygous, meaning that they are either orange or black
The inactivated X allele is a barr body
Females have orange and black patches as a result of random inactivation of barr bodies --
Correct Answer --Using point form outline how dosage compensation works in Tortoiseshell
cats.
Sex-limited: trait is only present in one sex
, Sex-influenced: the dominance of the trait is reversed btw. the sexes -- Correct Answer --What is
the difference between a sex-limited and sex-influenced charactertistic?
D. Genetic Linkage -- Correct Answer --Which phenomenon is an exception to Mendel's
principle of independent assortment?
A. Random fertilization
B. Epistasis
C. Segregation
D. Genetic Linkage
Linkage keeps genes that are close together on the same chromosome together, and crossing over
mixes things up, which can complicate things.
Linkage: no genetic recombination
Crossing over: genetic recombination -- Correct Answer --Explain how linkage and crossing over
have opposite effects.
C. AB and ab -- Correct Answer --A cross between aaBB and AAbb produced AaBb F1 plants.
The recombinant gametes produced by the F1 dihybrids would be?
A. Ab and aB
B. aB and ab
C. AB and ab
2025
Patterns of Inheritance: dominance and codominance
*** -- Correct Answer --The ABO blood group in humans represents what type(s) of patterns of
inheritance? What are the possible genotypes that determine each of the phenotypes in this
system?
X+ is black
Xo is orange
Males are hemizygous, meaning that they are either orange or black
The inactivated X allele is a barr body
Females have orange and black patches as a result of random inactivation of barr bodies --
Correct Answer --Using point form outline how dosage compensation works in Tortoiseshell
cats.
Sex-limited: trait is only present in one sex
, Sex-influenced: the dominance of the trait is reversed btw. the sexes -- Correct Answer --What is
the difference between a sex-limited and sex-influenced charactertistic?
D. Genetic Linkage -- Correct Answer --Which phenomenon is an exception to Mendel's
principle of independent assortment?
A. Random fertilization
B. Epistasis
C. Segregation
D. Genetic Linkage
Linkage keeps genes that are close together on the same chromosome together, and crossing over
mixes things up, which can complicate things.
Linkage: no genetic recombination
Crossing over: genetic recombination -- Correct Answer --Explain how linkage and crossing over
have opposite effects.
C. AB and ab -- Correct Answer --A cross between aaBB and AAbb produced AaBb F1 plants.
The recombinant gametes produced by the F1 dihybrids would be?
A. Ab and aB
B. aB and ab
C. AB and ab
