Class/Homework Assignment 11 – Module 11 (Trait Inheritance)Name: _________________
Genetics Practice Problems
1. In seals, the gene for the length of the whiskers has two alleles. Long whiskers are dominant, short
whiskers are recessive. We use the letter “r” to describe whisker length.
a. Write the homozygous dominant genotype. __________
b. What is the phenotype for the genotype above (#a)? ___________
c. Write the heterozygous genotype. ______
d. What is the phenotype for the genotype above (#c)? ________________
e. Write the homozygous recessive genotype.________
f. What is the phenotype for the genotype above (#e)?________________
g. In a cross between a homozygous dominant papa seal with a homozygous recessive mama seal, what
percentage of the offspring would be expected to have long whiskers?
2. Huntington’s disease is a autosomal dominant disease. Individuals who are homozygous dominant
and heterozygous get the disease, but individuals who are homozygous recessive do not get the disease.
a. What are the genotypes of people who get Huntington’s disease? _________________________
b. Both parents are heterozygous for the Huntington’s allele. What is the chance that their child will not
have Huntington’s disease? _______________________________
Which people are affected?
What shape represents a male?
What shape represents a female?
How do you know if people are married?
How do you know if people are siblings?
3. Webbed fingers is inherited as an X-linked recessive disease. An unaffected male marries an affected
female.
a. Draw a Punnett square of the possible offspring.
b. List the phenotypes of the possible children.
c. Draw a pedigree that displays the inheritance in your Punnett Square.
d. One of the sons above marries and has two children. Of those two children, a son is
unaffected daughter is a carrier. What is the genotype of their mom? (Add this to your
pedigree in ‘C’.)
4. Colorblindness is inherited as a X-linked recessive disease. An affected male marries a heterozygous
female.
a. Draw a Punnett square of the possible offspring.
b. List the phenotypes of the possible children.
c. Draw a pedigree that displays the inheritance in your Punnett Square.
d. If the heterozygous daughter marries an unaffected male, can you predict the offspring? If
so, add the information to your pedigree. If not, explain why.
Question 5 is on the next page.
5. Pedigree Practice Problems: Identify each pedigree as autosomal recessive, autosomal dominant, or Xlinked.
A
E
B
F
C
G
D
H
Class/Homework Assignment 10 – Module 10 (Mitosis and Meiosis)
Name: _________________
Part 1:
–
–
Mitosis
Phase
Prophase
Look at the pictures below. They represent the four stages of mitosis (prometaphase is not
represented) and the 8 stages of meiosis. Each picture has a letter in the top left corner. You
will fill in the letter of the picture below to the correct phase of mitosis and meiosis.
Not only will you tell me the letter of the picture that matches the phase, but you will also write
what is happening in the cell during this phase. Mostly what is happening to the DNA, but there
are other things happening as well.
Give me a written Description and
picture letter
Meiosis
Phase
Prophase I
Give me a written Description and picture
letter
Metaphase
Metaphase I
Anaphase
Anaphase I
Telophase
Telophase I
Prophase II
Metaphase II
Anaphase II
Telophase II
Part 2:
–
Answer the following questions for both mitosis and meiosis to show the similarities and
differences between the two cell divisions/processes.
Mitosis
Does the cell have interphase (including
DNA replication) before this process?
Meiosis
Meiosis IMeiosis II-
Summarize the overall purpose or goal of
each process. What types of cells go
through this division?
How many daughter cells are produced at
the end of each process?
In terms of diploid and haploid, what types
of daughter cells are produced at the end
of each process?
Meiosis IMeiosis II-
How similar are the daughter cells each of
the processes make?
If a human cell has 46 chromosomes, how
many chromosomes will each daughter cell
have after the process takes place?
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