Name:_________________________
Genetics study guide/ Practice problems
_____ 1. different forms of a gene. Ex-Roll tongue & Cannot roll tongue
_____ 2. cell division that produces sex cells
_____ 3. coiled pieces of DNA and protein
_____ 4. the letter combination for a trait
_____ 5. cell division that produces body cells
_____ 6. an organism’s appearance
_____ 7. genotype with two different alleles
_____ 8. genotype with the same alleles
_____ 9. a section of DNA that codes for a trait.
A.
B.
C.
D.
E.
F.
G.
H.
I.
J.
K.
Dominant trait
Recessive trait
Homozygous
Heterozygous
Mitosis
Meiosis
Gene
Chromosome
Allele
Phenotype
genotype
_____10. trait observed when at least one dominant allele is present
11. SpongeBob’s mother is so proud of her son and his new wife, SpongeSusie, as they are expecting a
little sponge. She is hoping that the new arrival will have blue eyes like SpongeBob and many
members of her family. If SpongeSusie is heterozygous for her brown eyes, what are the chances
that the baby sponge will have blue eyes? Create a Punnett square to help you answer this
question.
a.
List the genotypes of each parent: (1 pt)
SpongeBob: _____
wife:
_____
b.
List the possible genotypes for their children
c.
List the possible phenotypes for their children.
d.
What are the chances of having a child with blue eyes? _____%
What are the chances of having a child with brown eyes? _____%
12. A male black rabbit and female brown rabbit have 4 black baby rabbits, each with the genoype Bb.
a. What is the dominant trait? ________________
b. What are the most likely genotypes of the parents?
Female rabbit: ___________
Male rabbit: ___________
13. One of Spongebob’s cousins, SpongeBillyBob, recently met a cute squarepants gal, SpongeGerdy,
at a local dance and fell in love. Use your knowledge of genetics to answer the questions below.
A. If SpongeGerdy’s father is a heterozygous squarepants
and her mother is a roundpants, what is her genotype?
Complete the Punnett square to show the possible
genotypes that would result to help you determine
Gerdy’s genotype.
B. What is Gerdy’s genotype? __________
14. Look at Jenna’s chromosomes and answer the questions below.
From father
mother
Jenna
From
w
W
E
E
C
C
h
h
Trait
Ear Movement (E,e)
Winking (W,w)
Hand clasp (H, h)
Cleft Chin (C, c)
Dominant Gene
Cannot wiggle
Can wink
Left thumb on top
Have cleft chin
Recessive Gene
Can wiggle
Cannot wink
Right thumb on top
No cleft chin
Answer the following in complete sentences. Be sure to include
your reasoning (how you came up with that answer.)
a. Can Jenna wink? _________________________________________
_______________________________________________________
b. Does Jenna’s dad clasp with his right or left thumb on top?
_______________________________________________________
_______________________________________________________
c. Does Jenna’s father have a cleft chin? _______________________
_______________________________________________________
d. Can Jenna’s sister wiggle her ears? __________________________
_______________________________________________________
15. Label each of the following with mitosis, meiosis, or both:
a. Creates sperm or egg cells
_________________
b. Creates cells with 46 chromosomes
_________________
c.
d.
e.
f.
DNA is doubled in this process
Creates 2 identical cells
Creates 4 different cells
Creates cells with 23 chromosomes
_________________
_________________
_________________
_________________
16. Answer the following questions based on the pedigree below for hitchhiker’s thumb.
Hitchhiker’s thumb
a. Is hitchhiker’s thumb a dominant or recessive trait? How do you know? ________
__________________________________________________________________
b. What is person III-1’s genotype? How do you know? ______________________
__________________________________________________________________
c. How are person II-1 and II-4 related? ___________________________________
d. How many children do persons II-1 and II-2 have? ________________________