WorksheetsGenetics & Heredity
Total questions: 20
Worksheet time: 40mins
Name
Class
Date
1.
The passing of genetic traits from parent to offspring is called
a)
cross-pollination
b)
cross-breeding
c)
heredity
d)
genetics
2.
Sperm from one plant fertilizes the eggs of the same plant in
a)
cross-pollination
b)
cross-breeding
c)
self-pollination
d)
self-breeding
3.
What step did Mendel take to be sure that his pea plants did not self-pollinate?
a)
He used two white plants
b)
He removed the anthers of one plant.
c)
He added anthers to both plants
d)
He used plants that were not true breeding
4.
When a plant self-pollinates and all offspring have the same trait as the parent, it is called
a)
true-breeding plant.
b)
cross-breeding plant
c)
self-propagating plant.
d)
hybrid plant.
5.
When parents with different traits are bred, a trait that reappears in the second generation after disappearing in the first generation is a
a)
dominant trait
b)
true-breeding trait
c)
recessive trait
d)
characteristic
6.
When a first-generation plant self-pollinates, what is the ratio of dominant to recessive traits in the second-generation plants?
a)
1:3
b)
4:1
c)
1:4
d)
3:1
7.
If a plant with the genotype Pp is allowed to self-pollinate, what are the possible genotypes of the offspring?
a)
PP, pp, pp, PP
b)
Pp, Pp, Pp, Pp
c)
Pp, PP, pp, PP
d)
PP, Pp, pP, pp
8.
If a plant with the genotype PP is crossed with a plant with the genotype pp, what are the possible genotypes of the offspring?
a)
PP, pp, pp, PP
b)
Pp, Pp, Pp, Pp
c)
Pp, PP, pp, PP
d)
PP, Pp, pP, pp
9.
The mathematical chance that something will happen is known as
a)
possibility
b)
probability
c)
percentage
d)
product
10.
An example of how several genes influence one trait is
a)
eye color and fur color in a white tiger
b)
shades of eye color in humans
c)
whether a pea seed is smooth or wrinkled.
d)
whether a pea flower is purple or white.
11.
If a true-breeding male plant with wrinkled seeds (ww) is crossed with a true-breeding female plant with round seeds (WW), describe the seeds of the offspring.
a)
all round seeds
b)
three round seeds and one wrinkled seed
c)
all wrinkled seeds
d)
half wrinkled seeds and half round seeds
12.
There are usually 46 chromosomes in a human
a)
sperm cell.
b)
egg cell.
c)
DNA molecule.
d)
body cell.
13.
Chromosomes that carry the same set of genes are called
a)
homologous alleles
b)
homologous genes
c)
homologous zygotes
d)
homologous chromosomes
14.
What is an organism’s appearance called?
a)
its genotype
b)
its phenotype
c)
its dominant trait
d)
its recessive trait
15.
What kind of traits seem to disappear in the first generation?
a)
genotypes
b)
phenotypes
c)
dominant traits
d)
recessive traits
16.
Some grasshoppers that eat certain plants develop yellow and black coloration because their environment influences their
a)
genotype.
b)
phenotype
c)
chromosomes.
d)
DNA
17.
If most human offspring receive 23 chromosomes from the mother, how many chromosomes do they receive from the father?
a)
20
b)
78
c)
46
d)
23
18.
What is a feature that has different forms in a population?
a)
nuclear membrane
b)
trait
c)
characteristic
d)
cell
19.
What is one internal environmental condition that can influence a person’s height?
a)
age
b)
sunlight
c)
nutrition
d)
genotype
20.
What does the process of meiosis make?
a)
Identical cells
b)
Cells with half the DNA of the organism
c)
chromosomes
d)
new alleles
100 %
