Download 7th Grade Science

7th Grade Science
Genetics Study Guide
2/4/13
1. Be able to tell the function of the following cell
2. Cytoplasm— organelles:
a. Mitochondria—produces the energy for the cell
b. Cell membrane—controls what comes in and out of the cell
c. Nucleus—the brain of the cell.
d.
e. Cell wall—gives structure to a plant cell. The “bones” of a plant cell
f. Vacuole—storage unit for water and food
g. Chloroplast—where photosynthesis occurs in a plant cell
h. Chlorophyll—the green pigment responsible for absorbing sunlight for
photosynthesis
3. Be able to contrast asexual and sexual reproductionAsexual= 1 parent Sexual= 2
parents
4. Tell 2 advantages of asexual and 1 disadvantage of asexual reproductionAsexual=
1) do not have to wait for a mate 2.) makes more offspring
Disadvantage) if a mutation or problem occurs, since offspring are genetically
identical, then the problem could cause a population to become extinct.
5. Tell 1 advantage and 1 disadvantage of sexual reproduction Sexual= Advantage)
allows for better adaptation from changes in the environment Disadvantage) need
to find a mate and takes longer to reproduce
6. Tell some examples of asexual reproduction and what each do:
a. Budding—offspring grow off of the parent (yeast)
b. Cell division (mitosis), (binary fission)—one cell divides into two (binary
fission is in bacteria)
c. Regeneration—organism “grows” or regenerates offspring
7. Be able to contrast meiosis and mitosis and be able to tell what types of cells each
process produces. Meiosis produces sex cells with ½ of chromosomes. Mitosis
makes body cells with full number of chromosomes
8. Tell which process from #6 produces diploid and haploid cells. Meiosis produces
haploid, mitosis produces diploid
9. Be able to know the definitions of the following terms:
a. Dipoloid—full # of chromosomes
b. Haploid—1/2 # of chromosomes
c. Sex cell—egg or sperm
d. Fertilization—egg + sperm
e. Egg—female sex cell
f. Sperm—male sex cell
10. Be able to tell that after meiosis occurs in an organism, what is the next process
that must happen?fertilization
11. Be able to tell what cell organelle has the genetic material?
12. Know the definition of the following terms:
a. Chromosome—made from DNA contains genes
b. Gene—a section of a chromosomes that contains a trait
c. Trait—a characteristic of an organism
d. Genetics—the study of the passing of traits
e. Heredity—the passing of traits from parents to offspring
f. DNA—the blueprint for life
13. Be able to tell the difference between genotype and phenotype.
14. Be able to define the following terms:
a. Heterozygous—two different genes
b. Homozygous—having two dominant or two recessive
c. Hybrid—another word for heterozygous
d. Purebred—another word for homozygous
e. Punnett square—tool used to predict outcomes of specific traits from
parents to offspring
15. Be able to fill in a punnett square after being given an example of the parents.
16. Contrast a dominant (Occurs the most) and a recessive(occurs not as often) gene.
17. Be able to tell how many chromosomes humans have? 46 How many pairs is
this?23
18. Why do all chromosomes from organisms that reproduce sexually occur in pairs?
19. Be able to tell the chromosome combination for a boy and a girl: (these are called
the SEX CHROMOSOMES because they determine gender)
a. Male—XY
b. female—XX
20. Be able to define these terms:
a. Allele—different forms of a gene (another word for a gene)
b. Homologous chromosomes—matching chromosomes
21. Be able to distinguish between a learned behavior and an inherited behavior. If
given examples in a question, be able to tell if the behavior or trait is inherited or
learned.
22. When given a problem in which you will need to make a punnett square, be able
to tell the probability or percentage of the offspring that will show the dominant
or recessive trait.
The test will consist of multiple choice questions and two open responses. Be prepared
for a long assessment for this unit. Good Luck!!!!
Mrs. Jones