WorksheetsGenetics Intro Review
Total questions: 24
Worksheet time: 52mins
Name
Class
Date
1.
If a heterozygous tall pea plant is crossed with a short pea plant, what are the possible genotypes of the future offspring?
a)
100% Tt
b)
50% Tt, 50% tt
c)
75%Tt, 25%tt
d)
25%TT, 50%Tt, 25%tt
2.
What is a phenotype?
a)
The expression of a trait; what you see.
b)
refers to the genetic makeup of an individual
c)
An organism that has the same genes for a trait (ex. TT or tt)
d)
the passing of traits from parent to offspring
3.
What does heterozygous mean?
a)
An organism that has the same genes for a trait (TT or tt)
b)
An organism that has different genes for a trait (Tt)
c)
When neither gene is fully dominant; offspring is a mixture of both
d)
the different forms of a trait (hair color--> brown, blonde, red
4.
An allele whose trait only shows up when no dominant allele is present.
a)
hidden allele
b)
dominant allele
c)
recessive allele
d)
present allele
5.
having two of the same genes for the trait (sometimes called purebred).
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
6.
A human usually has _____ total chromosomes.
a)
6
b)
22
c)
4
d)
46
7.
Which of the following alleles is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
8.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
9.
AA and Aa always show up as
a)
dominant
b)
recessive
10.
A dog gives birth to 5 puppies. What percentage of the chromosomes does each puppy share with the mother?
a)
25%
b)
50%
c)
75%
d)
100%
11.
B=brown eyes
b= blue eyes
What is true about two brothers that have brown eyes?
One has genotype BB the other Bb.
b= blue eyes
What is true about two brothers that have brown eyes?
One has genotype BB the other Bb.
a)
they have same phenotype and genotype
b)
they have different genotypes and phenotypes
c)
they have same phenotype but different genotypes
d)
they have same genotype but different phenotypes
12.
An organisms observable physical traits
a)
genotype
b)
phenotype
13.
A punnet square helps show ....
a)
mutations
b)
the law of segregation
14.
The circled Hh alleles seen in the photo are:
a)
homozygous
b)
heterozygous
15.
What determines the traits of an organism?
a)
number of nitrogen bases
b)
presence of ribose or deoxyribose in a nucleic acid
c)
sequence of nitrogen bases in DNA
d)
ratio of AT to CG base pairs
16.
Which of the following is a nucleotide found in DNA?
a)
adenine + phosphate group + thymine
b)
cytosine + phosphate group + guanine
c)
deoxyribose + phosphate group + polymerase
d)
deoxyribose + phosphate group + cytosine
17.
How many chromosomes are shown in a normal human karyotype?
a)
2
b)
23
c)
44
d)
46
18.
The passing of traits from parent to offspring
a)
Heredity
b)
Genetics
c)
Hybrid
d)
Probability
19.
Another name for a sex cell is a:
a)
gamete
b)
embryo
c)
bone cell
d)
muscle cell
20.
The actual genetic makeup of an organism is the ____________
a)
Phenotype
b)
Homozygous
c)
Genotype
d)
Heterozygous
21.
The physical trait that is displayed is the __________________
a)
Genotype
b)
Heterozygous
c)
Homozygous
d)
Phenotype
22.
The allele that is expressed phenotypically and is written with an upper case letter
a)
Recessive
b)
Homozygous
c)
Dominant
d)
Heterozygous
23.
Which of the Mendel's laws describes that during meiosis, the allele pairs separate from each other into separate gametes?
a)
Law of Dominance
b)
Law of Segregation
c)
Law of Blending
d)
Law of Independent Assortment
24.
Which of Mendel's Laws describes that each pair of alleles sort separately from the allele pairs for other genes or traits?
a)
law of dominance
b)
law of segregation
c)
law of blending
d)
law of independent assortment
100 %
