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WorksheetsGrade 8 Review
Total questions: 23
Worksheet time: 12mins
A tall plant (TT) is crossed with a tall plant (Tt). What is the phenotype of the offspring?
50% homozygous dominant; 50% heterozygous; 100% tall
25% homozygous dominant; 75% heterozygous; 100% short
100% homozygous dominant; 100% tall
50% homozygous dominant; 50% heterozygous; 100% short
The two sex chromosomes are X and Y. To be female, you would have which of the following chromosomes?
XX
YY
XY
Which trait does a puppy inherit from its parents?
fur color and pattern
food brand preference
obedience to commands
affection for a specific home
What are autosomal chromosomes?
Chromosomes that determine just your eye color and hair color.
Chromosomes that determine if you are biologically male or female.
Chromosomes that do not determine if you are biologically male or female.
The division process that cells undergo to repair or replace damage or to reproduce exact copies is called ________________.
mitosis
meiosis
synthesis
replication
A woman who is a carrier of an X-linked recessive trait will have a ______ chance of passing that trait to her sons.
0%
25%
50%
100%
A linear code of three sequential bases on one side of a DNA molecule is a _____________.
codon
gene
base pair
amino acid
What part of protein synthesis does this diagram represent?
mRNA
rRNA
tRNA
RNA
The genetic code carries ____________________.
ATP across the cytoplasm
lysosomes around to kill bacteris
molecules through the cell membrane
instructions for translating information into proteins
What are sex chromosomes?
Chromosomes that have many genes to determine your eye color.
Chromosomes that determine if you are biologically male or female.
Chromosomes that do not determine if you are biologically male or female.
A zoo needs to know which of three male lions fathered a litter of cubs.
DNA fingerprinting
genome sequencing
organism cloning
gene therapy
Two heterozygous red flowers (white flowers are recessive) are crossed. What is the phenotype of the offspring?
50% red; 50% white
75% white; 25% red
25% red; 25% pink; 50% white
75% red; 25% white
Which gender can be carriers of colorblindness and not have it?
Just males
Just females
Both genders
After meiosis, sex cells have _________ the number of chromosomes as body cells.
the same
half of
more than
a quarter of the
How many females are in this pedigree?
3
4
6
7
DNA molecule segment is : TTACGCAAG The mutated DNA segment is TTCGCAAG. This is an example of ___ mutation.
Deletion
Insertion
Inversion
Substitution
Which of the following describes a variation?
A characteristic of an organism.
A difference within a characteristic of an organism.
Something that describes why people are the same.
Something that describes why people are different.
A mutation is defined as:
A change in the cell's structure
A change in the DNA sequence
Anything that changes in an embryo
Any change in the physical features of a human
Genetic mutations can be __________________.
harmful only
beneficial only
neutral only
beneficial, harmful, or neutral
A fertilized egg has _________ chromosomes as the body cells of a parent.
more
less
1/2
the same number of
What type of chromosomal abnormality do people with Down Syndrome have?
trisomy 21
dominant inheritance
monosomy 21
recessive inheritance
What determines gender in humans?
autosomal chromosomes
chromosome 21
codominance
the X and Y chromosome
What is the problem with this karyotype?
This karyotype is from a gamete.
This karyotype has no abnormality.
This karyotype shows Trisomy 21
This karyotype is missing a sex chromosome.
