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Genetics And Heredity Unit Review
Test Description: Genetics and Heredity Unit Review
Instructions: Answer all questions to get your test result.
1) In humans, the allele for having a widow’s peak is dominant to having a straight hairline. Many people do not like the widow’s peak, so they shave it off. Will this affect their offspring?
A
No. Their offspring will have a widow’s peak if they inherit both recessive alleles from the parents.
B
No. Shaving the widow’s peak does not change their genotype, so the allele can still be passed on to offspring.
C
Yes. Offspring born with a widow’s peak will have a smaller peak because the allele was damaged.
D
Yes. There is no chance that the offspring will be born with a widow’s peak because the parents destroyed the trait.
2) Which scenario is an example of a physical characteristic of an organism that was influenced by environmental factors?
A
The pumpkin seeds were relatively flat and white.
B
The bark of a tree was scarred after a beaver gnawed it.
C
A baby was born with ten fingers and ten toes.
D
The black cat’s eyes were a bright green color.
3) The trade-offs in choosing to be tested for a genetic disease includes:
A
none of the above
B
you might find out you have the disease
C
it may become difficult to get health insurance or coverage
D
both of the above
4) Why would it be necessary to see a genetics counselor?
A
to see what family blood line may contain a genetic disorder
B
all of the above
C
to stay as healthy as possible
D
to know the probability or chance of the offspring inheriting a disease
5) DNA fingerprinting can be used to:
A
diagnose a genetic disease
B
none of the above
C
both of the above
D
identify a person
6) Diseases that are inherited are usually:
A
all of the above
B
caused by environmental factors
C
caused by viruses
D
caused by genes
7) What is a trait?
A
different forms of a characteristic or quality
B
different forms of a pedigree
C
different forms of meiosis
D
different forms of chromatids
8) What is heredity?
A
traits passing from parents to offspring
B
traits passing from offspring to parents
C
the ratio of dominant to recessive traits
D
plants that are cross-pollinated
9) Two forms of a gene, one from each parent, are called
A
genes
B
alleles
C
albinism
D
phenotypes
10) What is a phenotype?
A
a group of five alleles
B
the physical expression of a genotype
C
the way an organism feels
D
a dominant gene
11) Which diagram is used to trace (follow) a trait through generations of a family?
A
pedigree
B
selective breeding
C
meiosis
D
generation square
12) A plant with two dominant OR two recessive alleles is said to be
A
heterozygous
B
hybrid
C
cross-pollinating
D
homozygous
13) Two parents are both carriers for a genetic trait that is based on only one recessive allele. This means that their offspring:
A
will all be carriers for the trait
B
has a 50% chance of inheriting the trait
C
has a 25% chance of inheriting the trait
D
cannot have the trait
14) One of the first people to study patterns of heredity scientifically was:
A
Robert Hooke
B
Mary-Claire King
C
Antoine Madan
D
Gregor Mendel
15) Which of the following methods (ideas) can provide (give) information on human genetics?
A
breeding other organisms to compare traits
B
examining human DNA
C
studying human pedigrees
D
all of the above
16) Assume that a genetic trait is represented by the letter a. Which of the following would most likely be used to represent the recessive condition that IS expressed (seen)?
A
Aa
B
aa
C
AA
D
none of the above
17) Scientists often use other organisms to study genetics. Pea plants are sometimes chosen because:
A
they do not reproduce
B
they cause disease
C
they do not have cells
D
they grow quickly
18) What is the process called when body cells are copied with half the number of chromosomes at the end of this cell division cycle to create sex cells?
A
mitosis
B
meiosis
C
sex cells
D
a nucleus
19) Asexual reproduction occurs (happens) in humans in that
A
many body cells reproduce this way.
B
the parent cells do not divide.
C
none of our body cells reproduce this way.
D
meiosis occurs.
20) How does mitosis compare (different) to meiosis?
A
mitosis only occurs in single-celled organisms, while meiosis only occurs in animals.
B
mitosis only occurs in animals, while meiosis only occurs in single-celled organisms.
C
mitosis produces sex cells with half the genetic information, while meiosis produces two identical daughter cells.
D
mitosis produces two identical daughter cells, while meiosis produces sex cells with half the genetic information.
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