WorksheetsGenetics Test25
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
In humans, hair type shows incomplete dominance. Straight hair = SS, Curvy hair = CC, and Wavy hair is a
blend of those two alleles = SC. Cross a female who has wavy hair with a straight haired male. What type
of hair will their child have?
a)
0% Curly: 50% Straight: 50% Wavy
b)
25% Curly: 50% Straight: 25% Wavy
c)
0% Curly: 0% Straight: 100% Wavy
d)
100% Curly: 0% Straight: 0% Wavy
2.
What is the figure below called? It is a picture of the chromosomes of an organism.
a)
Karyotype
b)
Pedigree
c)
DNA Fingerprinting
d)
Gel Electrophoresis
3.
What is the figure below called? It is a chart the illustrates the passing of a trait in a family through the generations.
a)
Pedigree
b)
Karyotype
c)
Gel Electrophoresis
d)
PCR
4.
Organisms that have two identical alleles for a particular trait are said to be
a)
hybrid.
b)
homozygous.
c)
heterozygous.
d)
dominant.
5.
Yellow (g) pod color is recessive and green (G) pod color is dominant. If you cross a yellow pod plant with a green homozygous pod plant, what is the percentage of having the green pod plant?
a)
25%
b)
50%
c)
75%
d)
100%
6.
What is the phenotypic ratio of this Punnett square? A=Axial flower position and a=Terminal flower position
a)
25% Axial flower postion: 75% Terminal flower position
b)
50%Aa:50%AA:23%aa
c)
25%aa:50%Aa:25%AA
d)
75% Axial flower position: 25% Terminal flower position
7.
Situations in which one allele for a gene is not completely dominant over another allele for that gene (blending) is called___________________________
a)
multiple alleles.
b)
incomplete dominance.
c)
polygenic inheritance.
d)
multiple genes.
8.
What is the genotypic ratio of this Punnett square? A=Axial flower position and a=Terminal flower position
a)
25% Axial flower postion:75% Terminal flower position
b)
25%aa:50%Aa:25%AA
c)
75% Axial flower position: 25% Terminal flower position
9.
The is a situation in which both alleles contribute to the phenotype of an organism. (both alleles are dominant and are expressed)
a)
incomplete dominance
b)
codominance
c)
polygenic traits
d)
multiple alleles
10.
This is a situation in which a traits is produced by the interaction of several genes. (example skin color)
a)
incomplete dominance
b)
codominance
c)
polygenic traits
d)
multiple alleles
11.
What is it called when gene have more than two alleles?(example blood type A,B, and O)
a)
incomplete dominance
b)
codominance
c)
polygenic traits
d)
multiple alleles
12.
Variation in eye and human skin color are examples of ___________________. (many genes affect the outcome of the trait)
a)
incomplete dominance.
b)
codominance.
c)
polygenic traits.
d)
multiple alleles.
13.
Which example is said to be homozygous?
a)
TT
b)
Tt
c)
tt
d)
both tt and TT
14.
Which example is said to be heterozygous?
a)
TT
b)
Tt
c)
tt
d)
both tt and TT
15.
Which term describes the physical characteristics of an organism.
a)
genotype
b)
phenotype
c)
Punnett square
d)
allele
16.
What term refers to an organism having two different alleles for the same trait.
a)
homozygous
b)
heterozygous
c)
purebred
d)
gametes
17.
What is the phenotypic ratio of a heterozygous tall pea plant crossed with a heterozygous tall pea plant. T-Tall t-Short
a)
4 short:0 tall
b)
2 short: 2 tall
c)
3 short: 1 tall
d)
1 short: 3 tall
18.
What is the genotypic ratio of a heterozygous tall pea plant crossed with a heterozygous tall pea plant. T-Tall t-Short
a)
50% Tall: 50% Short
b)
75% Tall: 25%Short
c)
25%TT: 50%Tt: 25%tt
d)
50%Tt: 50%tt
19.
What is the phenotypic ratio of a heterozygous round pea plant crossed with a wrinkled pea plant.
R-Round r-wrinkled
a)
50% Round: 50% Winkled
b)
75% Round: 25%wrinkled
c)
25%RR: 50% Rr: 25%rr
d)
50%Rr: 50%rr
20.
If a homozygous white guinea pig is crossed with a homozygous white guinea pig, what is the probability that an offspring will have black fur? Black-B White-b
a)
25 percent
b)
50 percent
c)
75 percent
d)
0 percent
100 %
