WorksheetsPost Test Unit 2 Evolution
Total questions: 20
Worksheet time: 12mins
(1) Carrie is studying the genes of two fruit flies in her lab. She knows what alleles they have. She wants to know the potential combinations of alleles their offspring could inherit. Which of these would help Carrie identify the potential combinations?
Allele
Punnett Square
Carrier
(2) Which of these is an example of a trait a person may have because of heredity?
dark hair
Pierced ears
scar on a forehead
(3) Which of these choices describes a segment of DNA that determines a specific trait in a person, such as attached earlobes?
a phenotype
A gene
A chromosome
An allele
(4) Examine the Punnett square. Which of these choices gives the alleles of the parents shown in the Punnett square?
Bb and Bb
BB and BB
BB and Bb
bb and Bb
(5) Which choice best defines heredity?
the joining of sex cells to form the first cell of a new organism
the cycle through which an organism grows from a young form to a mature form
The color of the hair and shape of the nose
the passage of genetic instructions from one generation to the next
(6) Each pea plant has a gene that determines seed color. One version of the gene is for green seed color, and the other version of the gene is for yellow seed color. Which of these choices is another word for the two versions of the gene for seed color?
Trait
Gene
Allele
Genotype
(7) Which statement about genes is always true?
Genes are located on chromosomes outside of the cell nucleus.
Each gene is responsible for a single trait.
Genes are located on chromosomes within the cell nucleus.
Genes are worn everyday by living things
(8) The diagram shows a Punnett square for one trait. Which of these should be placed in the box with the question mark?
aa
Aa
AA
(9) Which statement about a zygote that forms by fertilization is correct?
A zygote has one-half the full set of chromosomes one forth from one parent.
A zygote has a full set of chromosomes, one-half from each parent.
A zygote has two full sets of chromosomes, one set from each parent.
(10) A pea plant with round seeds is crossed with a pea plant with wrinkled seeds. The figure shows the results of this cross. What can be concluded about wrinkled seeds?
The wrinkled shape is a recessive trait.
The wrinkled shape is a dominant trait.
The wrinkled shape is an acquired trait.
(11) Which of these is a situation that could lead to the extinction of a species?
increased habitat
increased food supply
increased competition
increased variation
(12) Which adaptation would best help a lily pad survive in the moving water of a stream? (Hint - It has to be able to stabilize itself)
Long roots
Large Leaves
Sweet scent
(13) What is a mass extinction?
the death of all members of many different species
the death of every member of a species
the death of one member of a species
(14) The figure shows two-spotted salamanders that belong to the same species. How does the concept of variation help us understand that the salamanders are members of the same species, even though they look slightly different?
Variation explains why some organisms survive while others do not.
Variation describes a group of organisms that live together in the same area.
Variation describes a range of physical traits among members of a species.
(15) Which of these choices is the definition of allele?
the form of a gene that is expressed
the combination of genes for a specific trait
one of the alternative forms of a gene
a trait that is visible.
(16) What is evolution?
the process in which individuals better adapted to their environment are more likely to survive and reproduce
Adaptation happening over and over again
a trait that allows organisms in a population to survive and reproduce in their environment
(17) Darwin's theory of natural selection consists of four important parts. Which of these correctly lists the four essential parts of natural selection?
asexual reproduction, genetic variation, selection, and differential reproduction
selection, extinction, underproduction, and struggle to survive
Environment, adaptation, natural selection, and genetic variation
(18) A drought suddenly strikes an ecosystem and reduces the nutrients available in the area. As a result, larger organisms are less likely to survive. What would you expect to happen to the population over time?
Death rates would increase and individuals in the population would tend to get larger
Death rates would increase and individuals in the population would tend to get smaller.
Death rates would decrease and individuals in the population would tend to get smaller.
(19) Natural differences between individuals within a species and a population exist. Which of these terms is used to describe these natural differences that can lead to observable difference in organisms.
Extinction
Variation
Population
(20) The picture shows the changes over time in a population of mice in the wild after a population of a certain bird has moved into the grassy fields where the mice live. The white and dark mice differ only in color. Which term would best be used to describe the three steps shown in the diagram?
overproduction
genetic variation
selective breeding
color change
