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WorksheetsGenetics/Heredity
Total questions: 15
Worksheet time: 8mins
Name
Class
Date
1.
A chromosome is best described as a
a)
gene that has more than one form.
b)
green cell found in many plants.
c)
strand of DNA containing genetic information.
d)
reproductive cell found in certain kinds of bacteria
2.
An organism’s physical appearance is its
a)
Genotype
b)
Phenotype
c)
Codominance
d)
Heterozygous
3.
Which term refers to physical characteristics that are studied in genetics?
a)
Traits
b)
Offspring
c)
generations
d)
hybrids
4.
The different forms of a gene are called
a)
Alleles
b)
Factors
c)
Masks
d)
Traits
5.
An organism that has two identical alleles for a trait is
a)
Codominant
b)
Tall
c)
Homozygous
d)
Heterozygous
6.
How many PAIRS of chromosomes does each human cell contain?
a)
2
b)
12
c)
23
d)
46
7.
Hair color is an example of an organism’s ___________.
a)
phenotype
b)
dominant allele
c)
recessive allele
d)
genotype
8.
The phenotype of an organism is _______________________.
a)
determined by its genotype.
b)
represented with letters.
c)
also called the organism’s genome.
d)
cannot be observed visually.
9.
Organize the following structures from the largest to the smallest:
a)
nucleus, cell, chromosome, gene, allele
b)
cell, nucleus, chromosome, gene, allele
c)
cell, nucleus, gene, chromosome, allele
d)
nucleus, chromosome, cell, gene, allele
10.
Which trait is most likely determined by genes?
a)
how old a person is
b)
what a person likes to eat
c)
when a person wakes up
d)
whether a person has dimples
11.
A chromosome is made of a molecule called __________________ .
a)
glucose
b)
PTC
c)
DNA
d)
ATCG
12.
If the body cells of an organism have twenty chromosomes, then the sex cells of that organism would have
a)
5 chromosomes
b)
10 chromosomes
c)
20 chromosomes
d)
40 chromosomes
13.
Chromosomes are found in the ____________ of the cell
a)
Chloroplast
b)
Nucleus
c)
Cytoplasm
d)
Mitochondria
14.
He is known as the father of modern day genetics.
a)
Gregory Mendel
b)
Greg Mendel
c)
Gregor Mendel
d)
Grace Mendel
15.
You have 46 of these in your nucleus.
a)
genes
b)
genotypes
c)
chromosomes
d)
phenotypes
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