I.
USE THE WORD IN A BOX O FILL IN THE
BLANKS.
Larynx
Alveoli
respiratory
bronchi
oxygen
Bronchiole
mouth
carbon dioxide
inhale
trachea
Nose
All animals need ___________1_________ to make energy
from food. We get this oxygen from the air that we breathe. In
order to get the oxygen into the blood where it can be
transported to the rest of the body, the air travels through a
system of organs called the _____2_____ system.
When you _____3________, oxygen enters the body through
the _____4____ or the _____5_____. From there it passes
through the pharynx which forces air into the ____6_____ and
food into the esophagus. The air travels down the trachea into
two branching tubes called ______7_______ and then on into
_________8___________. Finally, the air reaches the
________9______ where gas exchange between oxygen and
____________10____________ takes place.
6. What does codominance mean in genetics?
a. Both alleles are dominant.
b. Both alleles are recessive.
c. The alleles are neither dominant nor recessive.
d. Each allele is both dominant and recessive.
7. Which term refers to physical characteristics that are
studied in genetics?
a.
traits
b.
offspring
c.
generations
d.
Hybrids
8.. The different forms of a gene are called
a.
alleles.
b.
factors.
c.
masks.
d.
traits.
II. MULIPLE CHOICE
9. What does the notation tt mean to geneticists?
a. two dominant alleles
b. two recessive alleles
c. at least one dominant allele
d. one dominant and one recessive allelle
1. Factors that control traits are called
a. genes.
b. purebreds.
c. recessives.
d. parents.
10. An organism’s genotype is its
a. genetic makeup
b. feather color
c. physical appearance
d. stem height
2. Scientists call an organism that has two different alleles
for a trait a
a. hybrid.
b. trait.
c. purebred.
d. factor.
11. Which nitrogen base in RNA is NOT part of DNA?
a. adenine
b. guanine
c. cytosine
d. Uracil
3. What does the notation TT mean to geneticists?
a. two dominant alleles
b. two recessive alleles
c. at least one dominant allele
d. one dominant and one recessive allelle
4. If a homozygous black guinea pig (BB) is crossed with a
homozygous white guinea pig (bb), what is the probability
that an offspring will have black fur?
a. 25 percent
b. 50 percent
c. 75 percent
d. 100 percent
5. An organism’s physical appearance is its
a.
genotype.
b.
phenotype.
c.
codominance.
d.
heterozygous.
12. An organism that has two identical alleles for a trait is
a.
codominant.
b.
tall.
c.
homozygous.
d.
heterozygous.
13. A heterozygous organism has
a. three different alleles for a trait.
b. two identical alleles for a trait.
c. only one allele for a trait.
d. two different alleles for a trait.
14. Which of these traits is controlled by a gene with
multiple alleles?
a.
straight hairline
b. smile dimples
c.
widow’s peak
d. blood type
15. Which combination of sex chromosomes results in a
male human being?
a.
XX
b.
YY
c.
XY
d.
either XX or YY
IV. ANSWER THE FOLLOWING QUESTIONS.
16. A carrier is a person who has
a. one recessive and one dominant allele for a trait.
b.two recessive alleles for a trait.
c. two dominant alleles for a trait.
d.more than two alleles for a trait.
17. Sex-linked genes are genes on
a. the X chromosome only.
b. the Y chromosome only.
c. the X and Y chromosomes.
18. Pollutants dumped into the rivers and streams
eventually find their way to
a. the ocean
b. the atmosphere
c. groundwater supplies
d, forest
19. The average temperature of the earth’s atmosphere
may rise as a result of
a. the greenhouse effect
b. water pollution
c. garbage dumping
d. air pollution
20. Some endangered species of plants in tropical rain
forests may be sources of
a. fossil fuel
b. medicine
c. hazardous waste
d. life
III. IDENTIFY THE COMPONENTS OF
NUCLEOTIDES.
1.
_______________
3. ______________
2.
________________
1. Complete the Punnet square for a cross
between a homozygous red-flowered
snapdragon (RR) and a homozygous
white-flowered snapdragon (rr). Give the
ratio for the phenotype and the genotype.
Key
RR - red
rr - white
Rr - pink
Genotypic ratio_______________
Phenoypic Ratio ______________
2. Complete the Punnet square for a cross
between a black chicken (BB) and a white
chicken (WW). Give the phenotype of the
offspring in the F1 generation.
Key
BB - black
WW - white
BW - checkered
Phenotype:_________________
3. Using the following information
mentioned, complete the following table.
BLOOD TYPE
A
B
AB
O
POSSIBLE GENE PAIR
4- 8 . One chain of a DNA molecule has a nucleotide sequence
What is the sequence of the nucleotides on its partner chain
NITROGEN BASES
C
A
T
G
C
4. Suppose 60 ants live in a 4 sq m plot of
grass. What would be the population
density of the ants? What would the
population density be if 100 ants live in an
8 sq m plot of grass?
Prepared by:
Joycee A. Magday