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Mendelian Genetics

Total questions: 50

Worksheet time: 58mins

Name
Class
Date
1.

Who is known as the "father of genetics"?

a)

Charles Darwin

b)

Karl Ernst von Baer

c)

Gregor Mendel

d)

Francis Franklin

2.

Alleles (example: H or h) are alternative forms of a gene. How many alleles does a baby guinea pig inherit from their mother?

a)

1

b)

2

c)

23

d)

whichever one is dominant

3.

A HETEROZYGOUS individual would have the genotype:

a)

Hh

b)

hh

c)

HH

d)

Hi

4.

In pea plants, tall (T) plant alleles are dominant to short (t) plant alleles. If two tall plants (each with the genotype Tt) are crossed, what is the probability that the cross would result in a short pea plant?

a)

25%

b)

50%

c)

75%

d)

100%

5.

Genes determine the characteristics, or __?__, that an individual can have.

a)

chromosomes

b)

cells

c)

genetics

d)

traits

6.

Sections of DNA on a chromosome are called:

a)

nuclei.

b)

RNA.

c)

genes.

d)

traits.

7.
The term for the different forms of a trait. 
a)
DNA
b)
Chromosomes
c)
Genes
d)
Alleles
8.
The trait that always shows. 
a)
Dominant 
b)
Recessive
c)
Hidden
d)
Overt
9.
The hidden trait.  You need two of these alleles for the trait to show.
a)
Dominant
b)
Recessive
c)
Hidden
d)
Overt
10.
The genetic makeup of a trait.  (The letters represent this)
a)
Genes
b)
Phenotype
c)
Genotype
d)
Characteristics
11.
If a trait is homozygous the letters are the 
a)
Same
b)
Different
12.
If you are homozygous recessive, the genotype would be 
a)
AA
b)
aa
c)
Aa
13.
If you are homozygous dominant, the genotype would be 
a)
AA
b)
aa
c)
Aa
14.

the physical/observable characteristic

a)

phenotype

b)

genotype

15.

the organism's genetic makeup

a)

phenotype

b)

genotype

16.

Law of segregation states:

a)

the two alleles for each trait separate during meiosis

b)

the two alleles for each trait separate during mitosis

c)

a random distribution of alleles occur during gamete formation

d)

a ordered distribution of alleles occur during gamete formation

17.

Law of independent assortment states:

a)

the two alleles for each trait separate during meiosis

b)

the two alleles for each trait separate during mitosis

c)

a random distribution of alleles occur during gamete formation

d)

a ordered distribution of alleles occur during gamete formation

18.

Independent assortment happens:

a)

during metaphase I of meiosis I

b)

during metaphase II of meiosis II

c)

during metaphase of mitosis

19.

New combinations of genes are produced by:

a)

crossing over

b)

independent assortment

c)

random fertilization

20.

New combinations of chromosomes are produced through:

a)

crossing over

b)

independent assortment

c)

random fertilization

21.

What genotype is homozygous dominant?

a)

RR

b)

Rr

c)

rr

22.
In pea plants, the trait for tall stems is dominant over the trait for short stems. If two heterozygous tall plants are crossed, what percentage of the offspring would be expected to have the same phenotype as the parents?
a)
100%
b)
75%
c)
50%
d)
25%
23.
In snapdragons, Tallness (T) is dominant to dwarfness (t). In a cross between two plants that are homozygous for the recessive allele, the percent of offspring expected to exhibit tallness is
a)
 25%
b)
 75%
c)
100%
d)
0%
24.
What is the percentage of homozygous recessive offspring?
a)
0%
b)
25%
c)
50%
d)
75%
25.
Green peas are dominant (G) to yellow peas (g). What is the genotype for a hetereozygous dominant offspring?
a)
Gg
b)
gg
c)
GG
26.
In Mendel's pea plants, the homozygous recessive phenotype was white flowers.  If Mendel crossed two homozygous recessive pea plants, what color flowers would be seen in the offspring?
a)
white and purple
b)
white 
c)
purple
d)
lavendar
27.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
28.
B = brown eyes
b = blue eyes
What is true about these 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
29.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
30.
In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any red-flowering plant resulting from this species?
a)
rr
b)
R
c)
RR
d)
RR or Rr
31.
What is the phenotype of the offspring? (A-Brown hair; a-blond hair) 
a)
50 % Brown Hair and 50% Blond Hair 
b)
25 % Brown Hair and 75% Blond Hair 
c)
75 % Brown Hair and 25% Blond Hair 
d)
0% Brown Hair and 100% Blond Hair 
32.
A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?
a)
0%
b)
25%
c)
50%
d)
75%
33.

In a monohybrid cross of complete dominance, what is the phenotypic ratio?

a)

1:2:1

b)

3:1

c)

9:3:3:1

d)

12:4

34.

In a population of 100 offspring, how many would you expect to be homozygous dominant in a cross between a homozygous dominant and a homozygous recessive?

a)

0

b)

25

c)

50

d)

75

e)

100

35.

In a population of 200 offspring, how many would you expect to be homozygous recessive in a cross between a heterozygous and a homozygous recessive?

a)

0

b)

50

c)

100

d)

150

e)

200

36.

In humans, having freckles (F) is dominant to not having freckles (f).


Two people with freckles get married and give birth to three children. Two of the kids have freckles and one does not.


Both parents must have which genotype?

a)

FF

b)

Ff

c)

ff

37.
What are the possible genotypes for this cross?
a)
TT = 25% Tt= 50% tt=25%
b)
all tall
c)
TT= 75% tt = 25%
d)
Tt = 100%
38.

What genotype would go in box 2? And is it Homozygous or Heterozygous?

a)

BB Heterozygous

b)

Bb Heterozygous

c)

bb Homozygous

d)

Bb Homozygous

39.

If a homozygous tall man and a heterozygous tall woman were to have a child, what are the possible genotypic and phenotypic ratios?

a)

Phenotypic ratio 100% tall; Genotypic ratio 1 TT: 1 Tt

b)

Phenotypic ratio 100% tall; Genotypic ratio 1 TT: 4 Tt

c)

Phenotypic ratio 50% tall; Genotypic ratio 1 TT: 2 Tt

d)

Phenotypic ratio 50% tall; Genotypic ratio 1 TT: 3 Tt

40.

Passing on traits from parents to offspring

a)

Chromosome

b)

Genotype

c)

Heredity

d)

Allele

41.

A genotype where only dominant alleles were passed on

from both parents for one trait

BB AA TT LL

a)

Homozygous Recessive

b)

Homozygous Dominant

c)

Dihybrid

d)

Heredity

42.

A genotype where only recessive alleles

were passed on from both parents for one trait

bb aa tt ll

a)

Heredity

b)

Homozygous Dominant

c)

Homozygous Recessive

d)

Phenotype

43.

A genotype where one dominant and one recessive allele was passed on from both parents for one trait.

Bb Aa Tt Ll

a)

Allele

b)

Homozygous Dominant

c)

Homozygous Recessive

d)

Heterozygous

44.

During meiosis and gamete formation, homologous (paired up) alleles split up

a)

Phenotype

b)

Law of Segregation

c)

Genotype

d)

Dihybrid Cross

45.

The genetic cross between two parents for one trait:

Example BB x bb

B = dominant for brown

b = recessive for blue

a)

Incomplete Dominance

b)

Dihybrid Cross

c)

Monohybrid Cross

d)

Iron Cross

46.

First Filial (child) Generation: the offspring of P1

a)

P1

b)

F2

c)

F1

d)

Heterozygous

47.

The ratio of homozygous dominant to heterozygous

to homozygous recessive offspring

a)

Genotypic Ratio

b)

Phenotypic Ratio

c)

Monohybrid Cross

d)

Homologous Pair

48.

If a homozygous recessive woman marries a heterozygous dimpled man. What is the chance of having a baby with dimples? (You must do a Punnett Square to find out BEFORE your select...you have time!)

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

49.

A homozygous dominant freckled woman marries a heterozygous man with freckles. What are the chances of a freckled baby?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

50.

What is the correctly written Genotypic Ratio?

a)

1 RR: 2 Rr: 0 rr

b)

3 Red: 1 white

c)

1 RR: 2 Rr: 1 rr

d)

5 Red: 1 White

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