Completing the Sentences: Complete the sentences with the choices below. Two of these
may be used twice.
hybrid/heterozygous
Gregor Mendel
recessive
genes
garden peas
the same
dominant
pure line/homozygous
two
1. A pioneer in the study of heredity was ______________________.
2. Mendel studied heredity by experimenting with ______________.
3. Traits are controlled by _________________.
4. In organisms that reproduce sexually, every trait has alleles for genes from
_______ parents
5. A trait that shows up in an organism is called a _________________ trait.
6. A trait that remains “hidden” is called a __________________ trait.
7. No organism has all ______________ or all ________________ traits.
8. An organism whose genes for a trait are all the same is called _____________
for that trait.
9. An organism whose genes for a trait are not the same, is called _____________
10. An offspring will definitely show an inherited trait if both his alleles for that
trait are _________________
Matching: Write the correct word on the line next to the description of that word.
1. ________________has mixed genes for a given trait a. dominant trait
2. ________________shows up in offspring
b. recessive trait
3. ________________a dominant trait in pea plants
c. pure line/homozygous
4. ________________has similar genes for a given trait d. hybrid/heterozygous
5. ________________remains hidden
e. tallness
Name: ______________________________________Date:________Period:____
Completing the Sentences: Use the choices below to complete the sentences. Two of these
may be used twice.
genes
46
specific
pairs
genetics
inherited
23
traits
chromosomes
1. The characteristics an individual has are called _____________________
2. Traits are passed down from parents to offspring. Another way of saying this is
“traits are ____________________.”
3. The study of heredity is called ______________.
4. Every plant and animal cell has tiny rod-shaped bodies called ______________.
5. A chromosome is made up of a chain of ______________________.
6. Genes determine the ________________of an individual.
7. Every organism has a ________________number of chromosomes.
8. In body cells (somatic cells), chromosomes are found in ____________.
9. Each of your body cells has ___________pairs of chromosomes. This is a total
of _________single chromosomes.
10. A human sperm or egg has ___________single chromosomes.
Matching: Write the word that best fits the description on the line provided.
1. ______________compound that makes up genes
a. genes
2. ______________made up of many genes
b. chromosomes
3. ______________have unpaired chromosomes
c. DNA
4. ______________pass on traits
d. body cells
5. ______________have paired chromosomes
e. gametes