SAT Biology E/M Practice Test on Classical Genetics- Quiz on Mendelian Genetics

Questions from Meiosis, Mendelian Genetics-ABO blood group, Pleiotropism

1. Colorblindness in humans is
in equal proportion in both sexes
caused in females by a heterozygous genotype
inherited by males from their male parent
caused in males by a homozygous genotype
caused by a recessive allele
2. A ratio of 3:1 in the phenotype of an organism occurs when
crossing over has occurred in Anaphase II
the alleles are incompletely dominant
only recessive traits are involved
alleles segregate during meiosis
only dominant traits are involved
3.Which of the following is not indicated by Mendel’s experiments?

independent assortment
dominant
recessive
segregation
incomplete dominance
4. In a heterozygous monohybrid cross, the dominant trait can be expressed in the phenotype of the F1 --- of the time.
0 percent
25 percent
50 percent
75 percent
100 percent
5. Homologous chromosomes line up in pairs in
metaphase I
metaphase of mitosis
metaphase II
interphase
prophase of mitosis
6. Trisomy 21 in humans is the result of
polygenic inheritance
pleiotropy
x-inactivation
nondisjunction
epistasis
7. Which of the following blood types are possible if the parents are A and O blood types?
A, B, and O
A and O
O only
B and O
AB only
8. Which of the following would indicate a test cross, where T represents the dominant, tall, trait and t represents the recessive, short, trait?
Tall × Tt
Tall × TT
TT × Tt
Tall × tt
short × tt
9. Which of the following would be the result of a true dihybrid cross?
AABB
AaBb
aabb
AABb
aaBb
10. ---refers to one gene affecting many traits
Linkage
Polygenesis
Nondisjunction
Epistasis
Pleiotropy
Score =
Correct answers:

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