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Biology: Intro to Genetics Quiz
Name:__________
1. A specific characteristic, such as seed color or height, is known as a:
a. hybrid
b. allele
c. trait
d. gene
2. Factors that are passed from parent to offspring that determine characteristics of the
offspring are called:
a. genes
b. traits
c. alleles
d. gametes
3. Different forms of the same gene are called:
a. traits
b. heterozygous
c. alleles
d. hybrids
4. The physical characteristics of an organism are called its:
a. genotype
b. heredity
c. dominance
d. phenotype
5. A situation in which a gene has more than 2 alleles is called:
a. complete dominance
b. codominant alleles
c. polygenic dominance
d. multiple alleles
6. 2 parents, 1 heterozygous dominant with dark hair (DD) and one homozygous
recessive with light hair, have 4 children. How many of these children would be
expected to have dark hair?
a. 100%
b. 25%
c. 50%
d. 75%
7. Two heterozygous rabbits, each with one allele for dark fur one and one allele for
white fur, mate. All of the baby bunnies are spotted black and white. What must the
pattern of inheritance for these alleles be?
a. incomplete dominance
b. codominance
c. multiple alleles
d. polygenic
8. Gametes are said to be “haploid” because they:
a. have twice the number of chromosomes compared to autosomes
b. have half the number of chromosomes compared to autosomes
c. each have a homologous chromosome
d. have 2 sets of genetic material
9. A gene map shows:
a. the number of possible alleles for a gene
b.the relative location of genes on a chromosome
c.where chromosomes are in a cell
d.how crossing over occurs
10. Crossing over of alleles is more likely to occur if the genes are located:
a. on different chromosomes
b. on the same chromosome, but close together
c. on the same chromosome, but far apart
d. in homologous pairs on the chromosome
Create punnett squares for the scenarios presented below, and answer the
questions.
11. Father is heterozygous for eye color, mother is heterozygous for eye color.
B= dark eye gene
b= light eye gene
a. What % of the offspring will have light eyes?
b. If this family has 12 children, how many will probably have light eyes?
c. how many will have dark eyes?
d. how many will be homozygous for eye color?
e. how many will be heterozygous for eye color?
12. 2 factor cross: father rabbit is heterozygous for both traits, mother rabbit is
heterozygous for both traits
B= stand up ears
D= brown fur
b= floppy ears
d= white fur
a. What % of offspring will have stand up ears and brown fur? _______
If 360 rabbits are born, how many will have stand up ears and brown fur?
___________
b. What % of offspring will have stand up ears and white fur? ________
If 360 rabbits are born, how many will have stand up ears and white fur?
____________
c. What % of offspring will have floppy ears and brown fur? _________
If 360 rabbits are born, how many will have floppy ears and brown fur?
_____________
d. What % of offspring will have floppy ears and white fur? ___________
________________
13. You’ve adopted a new female hamster for the lab, and you’re not sure of either it’s
full genotype, or Darwin’s. She is brown, with a sweet attitude, but the pet shop you
got her at warned you that her mother often bit people, and had funny, greenish fur.
You breed your new hamster with Darwin (he also has brown fur and a sweet
attitude) and 16 babies are born. These sixteen babies show the following
characteristics:
9 have brown fur and sweet attitudes
3 have brown fur and nasty attitudes
3 have green fur and sweet attitudes
1 has green fur and a nasty attitude
a. Which do you think is dominant- green fur or brown fur?
b. Which do you think is recessive- nasty temperaments or sweet
temperaments?
c. Based on the numbers above and your offspring percentages, what do you
think the genotype of your new hamster is- be sure to include the allele for fur
color (F or f) and the allele for temperament (N or n), and indicate with a
capital or lower-case letter whether these alleles are dominant or recessive.
d. Based on the same information, what do you think Darwin’s genotype must
be?
e. What is the genotype of the green furred, nasty hamster?
f. fill in a 2-factor cross punnett square to show the genotypes of the parents and
offspring above- be sure it results in the right combination of traits for the babies!
g. If you bred the green furred nasty hamster, with one of the one with green fur and a
sweet attitude, what would the outcome be? Fill in another two factor punnett square
to show what would happen, and then list the number of offspring from this cross
with:
brown fur and sweet attitudes:
brown fur and nasty attitudes:
green fur and sweet attitudes:
green fur and nasty attidues:
14.
Why is it important that gametes are haploid?
15.
What is “crossing over” during meiosis? What purpose does this process serve to
the resulting organism?
16. Compare the final results of mitosis and meiosis in terms of cell numbers and
genetic diversity.