Name: ______

Period: ______Date: ______

BIOLOGY UNIT 4 GENETICS I

KEY IDEA/s / Answer/s
1. Living systems reflect a hierarchy of levels of organization. This is described in the following flow chart:
______à ______--> ______
à ______à ______
à ______ / Your answer? ______
Correct Answer? ______
Why?
2. Genetic information is housed inside the cell’s ______. These genes make up the ______of a cell. ______are found in chromosomes as well, along with______. / Your answer? ______
Correct Answer? ______
Why?
3. Sexual reproduction yields offspring that are ______genetic ______of the parents. Fertilization involves the fusion of male and female______, each carrying ½ the genetic information that will be found in the______.
Does sexual reproduction occur in flowering plants? ______ / Your answer? ______
Correct Answer? ______
Why?
4. The ______divides repeatedly to form cells called ______cells. Through a process called ‘______,’ stem cells grow and develop into specialized cells (skin cells, nerve cells, etc).
Are cells from the stomach differentiated? ______. / Your answer? ______
Correct Answer? ______
Why?
5. What is the difference between allele and genes?
A gene codes for a ______[e.g. seed color].
An allele is an ______form of a gene (one member of a pair) that is located at a ______on a specific chromosome.
In pea plants, how many alleles for each gene did Mendel study? ______ / Your answer? ______
Correct Answer? ______
Why?
6. Mendel’s studies focused on traits controlled by a gene represented by two alleles. One allele is ______over the other. What is the other allele called? ______.
A ‘Punnett Square’ diagram is used to show the ‘segregation’ or ______of these alleles. / Your answer? ______
Correct Answer? ______
Why?
7. Chromosomes in cells occur in______. The total number of chromosomes in a cell [except in ______or gametes] is called its ______(2n) number. Gametes carry the ______(n) number, that is half the diploid number.
Cells from a sperm or egg cell have _____ chromosomes. A diploid human cell has ____ chromosomes [23 pairs]. / Your answer? ______
Correct Answer? ______
Why?

Practice Questions….

1. Given that a maple tree has sprouted from a cut maple stump, which inference about the new plant is most likely correct?

From: MEA, Maine Educational Assessment (Middle School Science)

A It has a better chance of surviving than its parent.

B It has the same DNA as its parent.

C It has half the number of chromosomes of its parent.

D It has larger leaves than its parent.

2. How much DNA does an offspring inherit from each parent?

A 75% from mother and 25% from father

B 50% from mother and 50% from father

C 40% from mother and 60% from father

D 25% from mother and 25% from father

3. Genes are unable to determine a person’s-

From: Alaska State Assessments (Middle Grades)

A eye color C number of teeth

B athletic ability D shape of earlobes

4. A friendly alien exhibits Mendelian inheritance. The allele for black-eyes is dominant over the allele for orange-eyes.