WorksheetsChapter 11: Intro. To Genetics
Total questions: 30
Worksheet time: 30mins
Name
Class
Date
1.
Where are genes not located?
a)
Mitochondria
b)
Chromosomes
c)
DNA
d)
Genome
2.
Which of the following are sources of genetic variation?
a)
meiosis, mitosis, crossing over
b)
sexual reproduction, mitosis
c)
meiosis, crossing over, sexual reproduction, mitosis
d)
DNA mutation, meiosis, crossing over, sexual reproduction
3.
What is a gene?
a)
any single amino acid in a multicellular organism
b)
a sex-cell that aids in organism reproduction
c)
a characteristic of any organism
d)
a set of instructions in the DNA sequence of an organism
4.
DNA provides the blueprint for the synthesis of proteins. A _________ is a segment of DNA that codes for one particular protein.
a)
genome
b)
gene
c)
trait
d)
chromosome
5.
The allele for brown hair (B) is dominant to the allele for blonde hair (b).
If a man with brown hair and a woman with blonde hair produce children, which genotype(s) would be possible in their offspring?
If a man with brown hair and a woman with blonde hair produce children, which genotype(s) would be possible in their offspring?
a)
BB, Bb, bb
b)
BB, Bb
c)
BB, bb
d)
Bb, bb
6.
Which of the following correctly organizes genetic material from the broadest category to the most specific category?
a)
Genome → DNA molecule → Chromosome → Gene
b)
Genome → Chromosome → DNA molecule → Gene
7.
Mendel's laws of heredity can be used to predict the results of simple genetic crosses. For example, if 2 pea plants that are heterozygous for yellow seed color (Yy) are crossed, there is a 25% chance that their offspring will express the recessive trait for green seed color (yy).
The above example shows how _______________ govern simple genetic recombinations.
The above example shows how _______________ govern simple genetic recombinations.
a)
Newton's laws
b)
the laws of thermodynamics
c)
the laws of probability
d)
the laws of cell cycle
8.
During meiosis, each parent cell divides ________ and produces ________ haploid daughter cells.
a)
Once, Two
b)
Once, Four
c)
Twice, Two
d)
Twice, Four
9.
Which of the following statements is true of meiosis?
a)
The cells formed at the end of the process only have half of the chromosomes as the original cells.
b)
The cells formed at the end of the process do not contain any of the genetic material from the orignal cells.
c)
The cells formed at the end of the process are identical to the original cells.
d)
The cell formed at the end of the process contain the same number of chromosomes as the original cells.
10.
What are the possible genetic variation of offspring in the following cross: BB x Bb
a)
BB, Bb, bb
b)
BB, bb
c)
BB, Bb
d)
BB, bb
11.
A cross between two squash plants that produce yellow squash results in 124 offspring: 93 produce yellow squash and 31 produce green squash. What are the likely genotypes of the plants that were crossed?
a)
both yy
b)
one YY, one Yy
c)
both YY
d)
both Yy
12.
A gen is a segment of DNA that codes for a particular protein. One DNA molecule typically contains thousands of genes. So, in order to fit into the nucleus of a cell, DNA molecules must be wound around proteins into structures known as ___________________.
a)
chloroplasts
b)
chromosomes
c)
cytoplasm
d)
cytoskeletons
13.
The variation of kernel color in corn plants is an inherited trait. R is the dominant allele for red kernels in a corn plant and r is the recessive allele for yellow kernels.
What is the probability that a corn plant with the genotype Rr crossed with a corn plant rr will have offspring with the genotype rr? Express your answer as a fraction.
What is the probability that a corn plant with the genotype Rr crossed with a corn plant rr will have offspring with the genotype rr? Express your answer as a fraction.
a)
1/4
b)
1/2
c)
4/4
d)
3/4
14.
Rachel grows pea plants in her backyard. Some of the pea plants have purple flowers, whereas others have white flowers. What does this indicate about Rachel's pea plants
a)
The pea plants cannot reproduce.
b)
The pea plants can only reproduce asexually.
c)
The pea plants have genetic variation.
d)
The pea plants all have identical genes.
15.
Freckles (F) are a dominant trait. If a cross was done between a homozygous recessive parent and a homozygous dominant parent, what is the probability that their children will have freckles?
a)
100%
b)
50%
c)
75%
d)
0%
16.
A recessive gene located on the X chromosome is the cause of color blindness in affected individuals. Males are more likely to be colorblind than females because
a)
males have only one copy of the X chromosome
b)
males have two copies of the X chromosome
c)
color blindness is associated with high testosterone levels
d)
females have no copies of the X chromosome
17.
A mole is a collection of skin cells containing an unusually high level of the skin pigment known as melanin. Most moles are acquired traits, appearing during the first two decades of a person's life.
Most moles are the result of an error in ______ during the production of a ______.
Most moles are the result of an error in ______ during the production of a ______.
a)
Mitosis, Somatic Cells
b)
Mitosis, Gametes
c)
DNA Replication, Somatic Cells
d)
DNA REplication, Gametes
18.
During sexual reproduction, gametes, or sex cells, are produced through the process of meiosis.
In meiosis, if the parent cell begins with 32 chromosomes, how many will chromosomes will be in the ending cells?
In meiosis, if the parent cell begins with 32 chromosomes, how many will chromosomes will be in the ending cells?
a)
8
b)
4
c)
32
d)
16
19.
During meiosis, genetic diversity does not result from which of the following processes?
a)
independent assortment
b)
replication of DNA
c)
crossing over
d)
DNA mutations
20.
Guinea pig coat color is determined by a single gene. The allele for black coat color is dominant to brown. In a cross between two black-haired guinea pigs, 20 offspring are born. If both parents were heterozygous, probability would predict that approximately how many of the 20 offspring would have brown hair?
a)
15%
b)
5%
c)
10%
d)
0%
21.
An organism's genotype describes its specific combination of alleles. For example, an Aa genotype is heterozygous for the A allele.
An organism's phenotype describes a visible trait, such as tall height, brown eyes, or black fur. How does genotypic variation occur?
An organism's phenotype describes a visible trait, such as tall height, brown eyes, or black fur. How does genotypic variation occur?
a)
Genotypic variation only occurs when genetic mutations occur.
b)
Genotypic variation occurs when alleles are randomly sorted during sexual reproduction.
c)
Genotypic variation only occurs during binary fission.
d)
Genotypic variations occurs when alleles are randomly sorted during asexual reproduction
22.
Which of the following best describes a sex-linked trait?
a)
a trait determined by a gene located on an individual's Y chromosome only
b)
a trait determined by a gene located on an individual's X chromosome only
c)
a trait determined by a gene located on an individual's X or Y chromosome
d)
a trait whose expression depends on whether an individual is male or female
23.
Humans possess two alleles, or variations, for each gene. The alleles may be the same, or they may be different.
When humans reproduce, their alleles are separated and independently sorted into different gametes, or sex cells. So, when sex cells randomly combine during fertilization to produce offspring, there is
When humans reproduce, their alleles are separated and independently sorted into different gametes, or sex cells. So, when sex cells randomly combine during fertilization to produce offspring, there is
a)
a decreased risk of mutation
b)
an increase in genetic variation
c)
a high probability of producing a clone
d)
a low probability of survival
24.
If a homozygous dominant parent and a heterozygous parent are crossed, what percentage of the offspring are expected to be homozygous dominant
a)
25%
b)
50%
c)
75%
d)
100%
25.
The genetic information that is passed from a parent to its offspring is found in ______.
a)
DNA molecules
b)
amino acids
c)
carbon atoms
d)
hydrogen bonds
26.
Lisa breeds snakes. She bred a solid brown male python with a tan female python whose body was covered with a black diamond pattern. Upon hatching, all of the baby pythons were brown with a faint diamond pattern.
Which of the following inheritance patterns most likely determined the color of Lisa's baby pythons?
Which of the following inheritance patterns most likely determined the color of Lisa's baby pythons?
a)
sex-linked
b)
autosomal dominant-recessive
c)
incomplete dominance
d)
codominance
27.
It is possible for an organism to inherit a gene with two dominant alleles. What is a gene with two dominant alleles that are expressed at the same time?
a)
heterozygous
b)
codominant
c)
polygenic inheritance
d)
incompletely dominant
28.
In the living world, there is a great deal of genetic variation. The genetic information of dogs differs from the genetic information for cats; the genetic information of plants differs from the genetic information of bacteria; the genetic information of a child differs from the genetic information of his or her father; and so on.
Which of the following is most likely to be a source of genetic variation among living organisms?
Which of the following is most likely to be a source of genetic variation among living organisms?
a)
asexual reproduction
b)
mitosis
c)
cancer
d)
meiosis
29.
Which is not a goal of meiosis?
a)
Produce gametes
b)
Create genetic variation
c)
divide cells
30.
What is the haploid number or a human?
a)
23
b)
46
c)
20
d)
40
100 %
