WorksheetsReview Genetics
Total questions: 37
Worksheet time: 19mins
To study the inheritance of traits Gregor Mendel used __
tomato plants
small shrubs
pea plants
various grasses
Mendel controlled the pollination of his pea plants in order to produce plants that were __
different every time
hybrids
recessive
true breeding
When Mendel crossed true breeding purple flowered plants with true breeding white flowered plants all of the offspring were purple because __
the allele for white flowers is dominant
The allele for purple flowers is dominant
The allele for purple is recessive
Purple is a better color for the plant
Mendel's initial cross (the parent cross) produced offspring referred to as the
F1
F2
P1
P2
G- Green
g - yellow
If a cross produces 3 plants with Green pods and 1 plant with yellow pods the genotype of the parents is __
unknown
heterozygous
both recessive
homozygous
The unit of inheritance that is responsible for a character or trait.
Allele
Chromosome
Gene
Chromatid
An allele that is fully expressed in an organism's appearance is __
unusual
heterozygous
homozygous
dominant
Looking at this flower you can see it's ___
phenotype
genotype
karyotype
pedigree
Looking at #2 in the picture, the alleles are ___
Heterozygous dominant
Homozygous dominant
Homozygous recessive
Which of the following is an example of an abbreviation of an individual's genotype in a monohybrid trait ?
TtBb
Tt
Tall
Tb
The abbreviation of an individual's genotype in a dihybrid trait would be which of the following?
TtBb
AA
Tall and brown
Tb
A possible abbreviation of the genotype for a GAMETE of an organism for a monohybrid trait would be which of the following?
TtBb
A
TB
AA
A possible abbreviation for the genotype of a GAMETE of an organism for a dihybrid trait would be which of the following?
TtBb
A
TB
AA
T-tall
t- short
If the parent cross is TT x tt the probability that the F1 will be tall is ___
25%
50%
75%
100%
T-tall
t- short
The probability that the F2 from the previous cross will be tall is ___ ( P1 cross is TT x tt F1 cross is Tt x Tt) )
*asking about F2
25%
50%
75%
100%
G- Green
g - yellow
In a cross between GG x Gg which is true about the probability of the offspring?
50% will be yellow
100% will be yellow
100% will be Green
50% will be Green
Which of the following is/are true about Punnett squares?
Choose all that apply.
It will show the possible genotypes of the offspring
it will show the alleles in the gametes of each parent
it shows all the possible results of a genetic cross
it shows the actual genotypes of the offspring
F1 offspring are crossed to produce F2 offspring with a 3:1 ratio of dominant to recessive. This illustrates which of Mendel's Laws?
Law of Dominance
Law of Independent Assortment
Law of Segregation
Law of Punnett
In gamete formation genes for different traits separate without influencing each other's inheritance. This illustrates which of Mendel's Laws?
Law of Dominance
Law of Independent Assortment
Law of Segregation
Law of Punnett
T-Tall R-round
t - short r- wrinkled
Which gametes would be produced by a heterozygous tall, wrinkled plant?
TR, Tr, tR, tt
Tr, tr
TtRr
TR, Tr, tr
T-Tall
t - short
R-round
r- wrinkled
How many types of gametes would be produced by a plant that is heterozygous tall and heterozygous round?
2
4
8
16
T-Tall
t - short
R-round
r- wrinkled
What is the phenotypic ratio of a cross between two heterozygous tall and heterozygous round plants?
10:2:2:2
8:4:2:2
9:3:3:1
8:8
Which cross best illustrates Mendel's Law of Dominance
TtRr x TtRr
TTRR x ttrr
TT x tt
TR x tr
Which cross best illustrates Mendel's Law of Independent Assortment
TtRr x TtRr
TTRR x ttrr
TT x tt
TR x tr
A black chicken (BB) crossed with a white chicken (WW) produces all checkered chickens. This type of inheritance is known as __
Multiple alleles
Incomplete dominance
Codominance
Polyploidy
A cross that results in the blending of the traits of the two parents is an example of __
Multiple alleles
Incomplete dominance
Codominance
Polyploidy
Most sex-linked traits are found on the __ chromosome.
Both the X and the Y chromosome
Y chromosome
X chromosome
all chromosomes, it takes all of them for the trait to be expressed
Colorblindness is an example of a disorder that is more common in males than females because ___
the allele is on the Y chromosome
it is passed from father to daughter
the allele for colorblindness is recessive and found on the X chromosome
males get the alleles from both their mother and their father
If a phenotypically normal woman (who's parents are both phenotypically normal) has a brother with hemophilia what is the probability that she is a carrier for that allele?
0%
25%
50%
100%
Not enough information to answer
What is the genotype of person I-1?
E- Free earlobes
e - attached earlobes
EE or Ee
Ee
ee
EE
Who is the youngest female in generation III?
E- Free earlobes
e - attached earlobes
III- 1
III-5
III -3
A person's blood type is an example of _
Codominance
Pleiotropy
Multiple alleles
Both codominance and multiple alleles
A trait that is controlled by multiple genes is an example of a ___ trait
monogenic
Pleiotropic
Polygenic
Multiple allele
People affected with the hereditary disorder Marfans syndrome are unusually tall, have thin fingers and toes and heart problems. All of these can be traced back to the mutation of a single gene. This illustrates which type of inheritance?
Pleiotropic
Polygenic
Multiple alleles
Inbreeding
Can a woman with type A blood and a man with type B blood have a child with type O blood?
Yes if they are IAIA and IBIB
Probably not
Yes if they are IAio and IBio
Yes if they are IAIA and IBio
When trying to determine the genotype of an organism that is dominant for a trait you can cross the unknown dominant with recessive. This is called a/an___
Selective breeding
Test cross
Mendel's 1st law
genetic engineering
Chromosomes #1-#22 in humans are referred to as __. Choose all that apply.
Autosomes
Sex- chromosomes
Body chromosomes
recessive
