Unit 7: Genetics
Unit 7 Study Guide
Name: _________________________________________ Date: ________________________ Period: _______
LT #1 – I can describe the basic process of meiosis.

What is the chromosome theory of inheritance?

Define haploid and diploid. Give an example of each.

What is the purpose of meiosis?

What is crossing over and during what phase of meiosis does it occur?

Draw a picture of the phases of meiosis I and meiosis II.

Give two differences between meiosis and mitosis.
LT #2 – I can identify and explain Mendel’s experiments, the law of segregation, and
the law of independent assortment.

Define genetics. Who was the father of modern genetics?
Unit 7: Genetics

What is cross pollination and how did Mendel use it?

Define allele.

What is the principal of dominance?

Define Mendel’s law of segregation.

Define Mendel’s law of independent assortment.
LT #3 – I can define and provide examples of the following: genotype, phenotype,
dominant allele, recessive allele, homozygous, and heterozygous.

What is a genotype?

What is a Phenotype?

Describe each of the following genotypes:
o TT
o Tt
o Tt
LT #4 - I can construct and interpret Punnett squares.

In pea plants, tall (T) is dominant over short (t). Cross two heterozygous pea
plants and give the phenotypic and genotypic ratios.
Unit 7: Genetics

In pea plants, there are two alleles for seed texture (R = round and r =
wrinkled) and two alleles for seed color (Y = yellow and y = green). A plant
that is heterozygous for seed texture and homozygous recessive for seed
color is crossed with a pea plant that is homozygous dominant for seed
texture and homozygous recessive for seed color. How many of the
predicted offspring will be wrinkled and yellow?
LT #5 - I can define and provide examples of complex inheritance patterns
(codominant alleles, incompletely dominant alleles, multiple alleles, and polygenic
traits).

Compare codominance and incomplete dominance. Describe how these
inheritance patterns work if true-breeding red and white flowers are
crossed.

In humans, there are four blood types: Type A, B, AB, and O. The alleles A and
B are codominant to each other and the O allele is recessive to both A and B
alleles. If a person with Type B blood marries someone with AB blood, what
Unit 7: Genetics
is there a possibility that the offspring will have type O blood? Why or why
not?

Define polygenic trait. Give some examples.
LT #6 – I can construct and interpret pedigree charts and karyotypes.

Draw what would be on the pedigree chart if a female is homozygous normal
(does not have the trait)

Draw what would be on the pedigree chart if a male is homozygous for a
trait.

Draw what would be on the pedigree chart if a male is heterozygous for a
trait. (what would this be called)

Albinism is an autosomal recessive disorder. Complete the following
pedigree: Two normally-pigmented parents have 3 children. The first child
(a girl) and their second child (a boy) have normal pigmentation. Their third
child (a girl) has albinism. That girl marries a normally pigmented male and
they have four children. The first three (two girls and a boy) have normal
pigmentation. Their fourth child (a girl) has albinism like her mother.
Unit 7: Genetics

Find the issue in the karyotype below.

What is the difference between autosomes and sex chromosomes? How
many of each do humans have?
LT #7 – I can describe the mode of inheritance in commonly inherited disorders.
 If a disorder is dominant, which genotypes would be affected? (Yes or no)
o Homozygous Dominant
o Heterozygous
o Homozygous Recessive
o
 In humans, acondroplasia “dwarfism” (D) is a dominant over normal (d). A
homozygous dominant (DD) dies before the age of one. A heterozygous (Dd)
person is dwarfed. A homozygous recessive (dd) individual is normal. A
heterozygous dwarf man marries a dwarf heterozygous woman, what is the
probablitly that they will have a baby that dies before the age of one?
Unit 7: Genetics
LT #8 – I can explain sex-linked inheritance.

Define sex-linked genes.

Which chromosome is larger, the X or the Y?

XX are __________________ and XY are ___________.

Colorblindness is a recessive sex-linked disorder. If a mother that is a carrier
for colorblindness and her husband, who has normal vision, have children.
How many of their daughters will be carriers for the disorder?