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WorksheetsGENETICS
Total questions: 40
Worksheet time: 23mins
A strand of DNA with the sequence A A C T T G will have a complimentary strand with the following sequence:
CCAGGT
AACTTG
TTCAAG
TTGAAC
Carriers of the colour-blindness trait include:
. Men who are heterozygous for the trait
Men who are homozygous for the trait.
Women who are heterozygous for the trait
Women who are homozygous for the trait
. Genetic traits of seeds are noted as follows:
L = long, l = short W = wrinkled, w = smooth Y = yellow, y = white R = ribbed, r = grooved
Which of the following is the genotype for a short, wrinkled, yellow, grooved seed?
llWwYYrr
LLWWyYRr
LlWwYYRr
llWwyyrr
Mendel discovered principles of inheritance because he:
Observed simultaneously all of the many characteristics in which the parents differed.
Believed that the hereditary characteristics of two individuals became thoroughly blended in the offspring.
Ignored all characteristics except a few markedly contrasting ones in which he studied.
Studied only the offspring obtained from a single mating.
If one parent has type A blood and the other parent has type B blood, what blood type will the offspring denoted by the white square and circle have?
Type A.
Type B.
Type O.
Type AB.
. Hemophilia is a sex-linked recessive trait in humans. If a father and a son are both hemophiliacs, but the mother is normal, her genotype must be:
X H X h
X h X h
X HX H
X hY
An example of alleles is:
T and t.
. AB and Tt.
TT and Tt.
X and Y.
An example of a genotype is
A tall pea plant
. R and r.
Hemophiliac
. TtHH.
Snap dragon color is an incompletely dominant trait. A red flower (RR) is crossed with white flower (rr)? What color are flowers that are Rr?
Red
Red and White
White
Pink
Which statement is true about X-linked genes?
The male needs two copies of the gene but will express the trait regardless of whether the alleles are dominant or recessive.
The male needs two copies of the gene but will express the trait only if both alleles are dominant.
The male needs only one copy of the gene and will express the trait regardless of whether the allele is dominant or recessive.
The male needs only one copy of the gene but will express the trait only if the allele is dominant.
The genotype for a yellow plant is...
Which of the following enzymes is needed for Transcription?
Helicase
DNA Polymeras
RNA Polymerase
Ligase
Topoisomerase
Given the mRNA sequence - 3' AUG CAU GGU.5'. What is the original DNA template strand?
5' TAC GTA CCA 3'
5' UAC GUA CGA 3'
3' UAC GUA CGA 5''
3' TAC GTA CGA 5'
Which of the DNA triplets would NOT code for Arg (arginine)?
GCA
GCG
GCU
GCC
Given the DNA strand: 3' TAC-TGT-GGT-TAA 5'. What is the amino acid sequence?
Met-Thr-Pro-Ile
Met-Pro-Thr-Ile
Ile-Pro-Thr-Met
Ile-Thr-Pro-Met
What is the role of tRNA?
To treat the DNA strand
To transfer codons
To transfer amino acids
To tackle mutations
What is the start codon?
UAC
TAC
AUG
GUA
Long radishes crossed with round radishes result in all oval radishes. This type of inheritance is:
Incomplete dominance.
Multiple alleles
Complete dominance.
Co-dominance
A form of vitamin D-resistant rickets, known as hypophosphatemia, is inherited as an X-linked dominant trait. If a male with hypophosphatemia marries a normal female, which of the following predictions concerning their potential progeny would be true?
All of their sons would inherit the disease
. About 50% of their sons would inherit the disease
All of their daughters would inherit the disease
None of their daughters would inherit the disease
. DNA replication can be described as
. semiconservative
. semiconservative
dispersive
degenerative
Choose the correct statement about the genetic code.
includes 61 codons for amino acids and 3 stop codons
almost universal; exactly the same in most genetic systems
three bases per codon
all of the above
DNA ligase is:
. an enzyme that joins fragments in normal DNA replication
an enzyme involved in protein synthesis
. an enzyme of bacterial origin which cuts DNA at defined base sequences
an enzyme which limits the level to which a particular nutrient reaches
If two heterozygous individuals mated and their first three children should a dominant trait, which of the following would be true?
their next child would have the dominant trait
their next child would have the recessive trait
there is a 25% chance their next child would show the recessive trait
they cannot have a child with the recessive trait
Concerning blood type, an AO mates with a BO. What are the possible blood types of the offspring?
A
B
O
All of these
Who are more likely to suffer from X-linked diseases and why?
females, because they have two X-chromosomes and are therefore more likely to inherit one with a disease
males, because they have only one X-chromosome and if it is mutated they have no back up copy
females, because one of their X-chromosomes is deactivated
both males and females are equally likely to suffer from X-linked disorders
The diagram represents a dihybrid cross between two pea plants heterozygous for both seed color and seed shape. What is the phenotypic ratio of the offspring?
1:1:1:1:2:2:2:2:4
1:3:3:9
1:4
4:12
Which Punnett square represents a cross between two parents that are heterozygous for purple flowers?
He was an Austrian monk whose experiments come ip with the principles and law of genetics
Alexander Fleming
Gregor Mendel
Charles Darwin
James Watson
