Name:_____________________
Hour:________________
Genetics Review
D
1. Mom: Dd
Dad: dd
What % of children will be:
-Homozygous Dominant: __0%_
-Heterozygous: __50%
-Homozygous Recessive: __50%
2. Mom: Rr
Dad: RR
d
d
Dd
dd
d
Dd
dd
R
r
R
RR
Rr
R
RR
Rr
A
A
a
Aa
Aa
a
Aa
Aa
E
e
e
Ee
ee
e
Ee
ee
B
B
What % of children will be:
-Homozygous Dominant: __50%
-Heterozygous:_ __50%
-Homozygous Recessive: __0%_
3. Mom: AA
Dad: aa
What % of children will be:
-Homozygous Dominant: __0%_
-Heterozygous: __100%_
-Homozygous Recessive: __0%_
4. Mom: Heterozygous
Dad: Homozygous Recessive
(Use the letter E)
What % of children will be:
-Homozygous Dominant: __0%_
-Heterozygous: __50%
-Homozygous Recessive: __50%
5. Mom: Homozygous Dominant
Dad: Heterozygous
(Use the letter B)
What % of children will be:
B
BB
BB
-Homozygous Dominant: __50%
-Heterozygous: __50%
-Homozygous Recessive: __0%_
b
Bb
Bb
Describe in detail why children look like their parents:
Use the following words in your explanation:






Cells
Chromosomes
Genes
Nucleus
Traits
DNA
People are made up of approximately 50,000,000,000,000 cells, which are the
most basic unit of life. Inside each and every one of them is a miniature “brain”
called a nucleus, which stores all of our important genetic information. If we look
inside this tiny but important organelle we will find 23 pairs of chromosomes. It is
on these structures that we see several different sets of instructions for many
different observable Traits, like eye color and hair color. These observable
characteristics are determined by the combination of genes which we inherited
from our parents. The chemical which makes all of this possible is called,
Deoxyribose Nucleic Acid or DNA. We look like our parents because we have the
same chemicals in our cells as they do in theirs, because they used it to make us!