Genetics quiz

Suitable for GCSE, Standard Grade, Intermediate 2 or Higher biology students.
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In rabbits, black fur (B) is dominant to brown fur (b).

1. What is the genotype of a black rabbit?
a. BB
b. Bb
c. bb
d. Either BB or Bb
e. Either Bb or bb

2. The black and brown versions of the gene are called:
a. Mutations
b. Alleles
c. Chromosomes
d. Gametes
e. Clones

3. If a true-breeding black rabbit mates with a brown rabbit, their offspring will be:
a. Homozygous and black
b. Heterozygous and black
c. Homozygous and brown
d. Heterozygous and brown

4. If two heterozygous black rabbits mate, how many of their offspring are likely to be black?
a. None of them
b. 1 out of 2
c. 1 out of 4
d. 3 out of 4
e. All of them

5. If a heterozygous black rabbit mates with a homozygous black rabbit, how many of their offspring are likely to be black?
a. None of then
b. 1 out of 2
c. 1 out of 4
d. 3 out of 4
e. All of them

6. If a black rabbit appeared in a population of brown rabbits, what might be the explanation?
a. A rabbit had inherited two copies of a recessive gene
b. Natural selection had changed a brown gene into a black one
c. A mutation had occurred

7. If a rabbit is black, what does this mean?
a. At least one of its parents is black
b. Both of its parents are black
c. At least one of its parents carries the black version of the gene but may not appear black
d. Both parents carry the black version of the gene but may not appear black

8. If a rabbit is brown, what does this mean?
a. At least one of its parents is brown
b. Both of its parents are brown
c. At least one its the parents carries the brown version of the gene but may not appear brown
d. Both parents carry the brown version of the gene but may not appear brown

9. What is the phenotype of a rabbit with the genotype bb?
a. Black
b. Brown
c. Homozygous
d. Heterozygous
e. Mutant

10. If a group of black rabbits is 'true breeding', what does this mean?
a. All of their descendants will be black
b. Some of their descendants will be brown
c. All of their ancestors were black
d. Some of their ancestors were brown

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