1. Which of the following is a heterozygous individual?
a) AA
b) Aa
c) aa
d) AaAA
2. Who is known as the “father of genetics”?
a) Charles Darwin
b) Albert Einstein
c) Gregor Mendel
d) George Mendelian
3. What best describes the concept of dominance?
a) When one allele can mask another
b) When one parent has stronger traits than the other
c) When one offspring will outcompete the others to pass on their DNA
d) When two alleles are expressed simultaneously
4. Intermediate inheritance is when the phenotype of the ____________ offspring displays a mixture.
a) Homozygous dominant
b) Homozygous recessive
c) Heterozygous
d) Majority of the
5. Codominance is when two _________ alleles combine and are expressed ____________.
a) Recessive; simultaneously
b) Dominant; separately
c) Recessive; separately
d) Dominant; simultaneously
6. A roan cow mates with a red bull. Is there any possibility for white calves?
a) Yes, but only 25% probability
b) No, they will all be red
c) Yes, but only 50% probability
d) No, they will be 50% and 50% red
7. A green algae and blue algae create turquoise algae. What is this an example of?
a) Codominance
b) Intermediate inheritance
c) Incomplete dominance
d) Recessiveness
e) Both b & c
f) All of the above
8. Which type of cross always yields a 1:2:1 ratio?
a) Heterozygous x homozygous dominant
b) Heterozygous x homozygous recessive
c) Heterozygous x heterozygous
d) Homozygous dominant x homozygous recessive
9. Which type of cross could yields a 9:3:3:1 ratio?
a) TTBB x ttbb
b) TtBb x TTBB
c) TtBb x ttbb
d) TtBb x TtBb
10. A monohybrid cross deals with how many genes?
a) One
b) Two
c) Three
d) Four
11. A dihybrid cross deals with how many genes?
a) One
b) Two
c) Three
d) Four
e) Sixteen
f) Eight
12. How many squares are there in a dihybrid cross?
a) Eight
b) Sixteen
c) One
d) Two
e) Four
13. Which chromosome determines colorblindness?
a) X chromosome
b) Y chromosome
c) One X and one Y chromosome
d) None of the above
14. Which of the following best describes the phenomena where recessive traits like white eyes in flies
occurs primarily in male offspring?
a) Codominance
b) Intermediate inheritance
c) Sex-linked inheritance
d) Multiple allelism
15. A heterozygous tall plant (Tt) is crossed with a homozygous recessive plant. What are the probabilities
of the offspring?’
a) 50% TT, 50% tt
b) 50% Tt, 50% tt
c) 100% Tt
d) 75% Tt, 25% tt
16. What is a gene?
a) A section of a chromosome that codes for a particular trait
b) A form of a chromosome, such as X or Y
c) A trait such as brown hair or brown eyes
d) An allele such as height
17. Blood types are an example of which of the following?
a) Codominance
b) Multiple allelism
c) Intermediate inheritance
d) Sex-linked inheritance
18. Can an A- mom and O+ dad have an O- child?
a) Yes, but there is only a 25% chance
b) No, there is no chance
c) Yes, there is a 50% chance
19. What is the probability of an AB+ mom and O- father to have an A+ child?
a) 50%
b) 0%
c) 100%
d) 25%
20. Which of the following traits could possible disappear from humans over billions of years?
a) Brown hair
b) Curly hair
c) Attached ears
d) Dimples
21. Which of the following traits would be seen in the majority of humans after billions of years?
a) Thin eyebrows
b) Brown eyes
c) Blue eyes
d) Red hair
22. How can the Y chromosome be used to trace “super ancestors” of men?
a) It passes from man to man genetically unchanged
b) Mutations on the Y can be traced
c) Despite migration, men from all over the world have similar mutations in their Y chromosome
d) All of the above
23. Where did Adam most likely come from?
a) The middle east
b) Africa
c) Asia
d) North America
24. What is the probability of a female child being colorblind if the mom is colorblind but the dad is not?
a) 100%
b) 0%
c) 50%
d) 25%
25. What is the probability of having blue eyes if both parents are heterozygous with brown?
a) 50%
b) 25%
c) 100%
d) 0%
ANSWERS:
1. B
2. C
3. A
4. C
5. D
6. B
7. E
8. C
9. D
10. A (per.1 #10 was lost, so for the written one I had created the answer was D)
11. B
12. B
13. A
14. C
15. B
16. A
17. B
18. B
19. A
20. C
21. B
22. D
23. B
24. B
25. B