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Genetics Overview

Total questions: 65

Worksheet time: 2hrs 48mins

Name
Class
Date
1.
An offspring will receive how many alleles from each parent to determine a specific trait?
a)
one
b)
two
c)
three
d)
five
2.
Which of the following is a phenotype?
a)
BB
b)
Bb
c)
bb
d)
Blue eyes
3.
having two of the same genes for the trait (sometimes called purebred).
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
4.
One form of a gene is called_______________
a)
a DNA
b)
a Phenotype
c)
a trait
d)
an allele
5.
If green is dominant over purple, then what is the genotype for this individual?
a)
Purple
b)
Green
c)
GG
d)
gg
6.
Which is the correct phenotype for this organism?
a)
BB
b)
blue
c)
green
d)
bb
7.
In pea plants, the tall allele is dominant to the short allele. What key would demonstrate this?
a)
Tall = T
Short = S
b)
Tall = T
Short = t
c)
Tall = t
Short = T
d)
Tall = TT
Short = tt
8.
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%
9.

Which of the following genotypes is homozygous dominant?

a)

Yy

b)

yY

c)

yy

d)

YY

10.

What is the genotypic ratio of the offspring?

a)

3:1

b)

1:3

c)

1:2:1

d)

2:2

11.

What are the phenotype percentages of the offspring?

(A-Brown fur color; a-white fur color)

a)

50 % Brown fur and 50% White fur

b)

25 % Brown fur and 75% White fur

c)

75 % Brown fur and 25% White fur

d)

0% Brown fur and 100% White fur

12.
What are the possible genotypes for this cross?
(Click the picture to see it without the text)
a)
TT = 25% Tt= 50% tt=25%
b)
all tall
c)
TT= 75% tt = 25%
d)
Tt = 100%
13.

B=Brown fur

b=tan fur

What percent of the offspring would be tan when you cross BbxBb?

a)

75%

b)

25%

c)

50%

d)

100%

14.
In rabbits, black fur (B) is dominant over brown fur (b). If a rabbit has brown fur, what can you conclude about its genotype?
a)
It is BB.
b)
It is Bb
c)
It is brown
d)
It is bb.
15.
This punnett square shows a cross between
a)
A hybrid Parent and a Homozygous parent
b)
A heterozygous parent and a heterozygous parent
c)
Two homozygous parents
d)
Two Hybrid Parents
16.
 One dog carries homozygous, long-haired traits (SS), and its mate carries homozygous short-haired traits (ss). Use a Punnett square to determine the probability of one of their offspring having long hair.
a)
100%
b)
75%
c)
50%
d)
25%
17.
Why are there no white rabbit babies?
a)
The white gene is not present in any of the babies.
b)
It takes two recessive genes to show the trait.
c)
Grey is a better color.
d)
Baby five will be white.
18.

Which of the following is correct?

a)

Yy is homozygous dominant.

b)

YY is heterozygous.

c)

yy is homozygous recessive.

d)

YY is homozygous recessive.

19.

Which of the following represents a heterozygous genotype?

a)

Aa

b)

AA

c)

aa

d)

Ab

20.

A recessive trait would appear in the phenotype of which of these?

a)

BB

b)

bb

c)

Bb

d)

Bf

21.

Which of the following best describes Mendel's law of dominance?

a)

When an organism has two different alleles of the same gene, both genes will be expressed equally.

b)

When an organism has two alleles, one of genes will be expressed and the other will be hidden.

c)

When an organism has two different alleles of the same gene, one will always be dominant.

d)

The stronger of the two genes will be expressed.

22.
What did Mendel call the two kinds of traits exhibited by the pea plants (one coming from the father, one from the mother)?
a)
Genesis
b)
Elective traits
c)
Alleles
d)
Quadrants
23.
Another word for homozygous is...
a)
purebred
b)
hybrid
c)
heterozygous
d)
dominant
24.
Tt is-
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
25.
If a pea plant were homozygous recessive for height, how would its alleles be represented?
a)
TT
b)
Tt
c)
tt
d)
tT
26.
A __________ is a segment of DNA that codes for a particular protein, which leads to a particular trait.
a)
Gene
b)
Allele
c)
Codon
d)
Nucleotide
27.

The physical expression of a trait is called the ...

a)

genotype

b)

phenotype

28.

Genotype: rr

a)

homozygous dominant

b)

homozygous recessive

c)

heterozygous dominant

29.

Genotype: TT

a)

homozygous dominant

b)

homozygous recessive

c)

heterozygous dominant

30.

Who is known as the "father of genetics"?

a)

Charles Darwin

b)

Karl Ernst von Baer

c)

Gregor Mendel

d)

Francis Franklin

31.

Which of the following is heterozygous?

a)

MM

b)

Mm

c)

mm

32.

What organism did Mendel study?

a)

pea plants

b)

onions

c)

mice

d)

cats

33.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
34.
Heredity is the passing of traits from _____________________ to _____________________
a)
predators to prey
b)
water to rain
c)
parents to offspring
d)
fungi to protists
35.
___________________________ is the field of science that studies of how traits are passed on, or inherited.
a)
dominant traits
b)
ratio
c)
phenotype
d)
genetics
36.
What is a gene?
a)
An entire chromosome that  codes for a trait
b)
a piece of clothing
c)
a piece of a DNA on chromosome that codes for a trait
d)
Chemical messengers in your brain that code for a trait
37.

What was the theory of genetics before Mendel did his experiments.

a)

All traits were random

b)

All traits skipped a generation

c)

All traits were decided by God

d)

All traits were a mixing of the the parents traits

38.

What specifically about Pea Plants did Mendel Study?

a)

Color of Pea Flower

b)

Colors of individual Peas

c)

Texture of Peas

d)

All of these

39.

Mendel's Law of Segregation means?

a)

Every person has two alleles for each trait, they segregate from each other and the dominant is passed more often.

b)

Every person has two alleles for each trait, Where two traits are being passed, they do not effect each other.

c)

Every person has two alleles for each trait, they segregate from each other and are passed down at random.

d)

Every person has two alleles for each trait, they segregate from each other and the recessive is passed more often.

40.

What is Mendel's Law of Independent Assortment?

a)

If the recessive allele is passed for one trait, then it is more likely that the recessive allele will be passed for the other trait.

b)

The passing of allele of one trait does not affect the passing of allele of another trait.

c)

If the dominant allele is passed for one trait, then it is more likely that the dominant allele will be passed for the other trait.

d)

If the dominant allele is passed for one trait, then it is more likely that the recessive allele will be passed for the other trait.

41.

Gregor Mendel removed the male parts from the flowers of some plants in order to:

a)

prevent hybrids from forming

b)

prevent cross pollination

c)

make controlled crosses between plants

d)

prevent females from pollinating

42.

Humans have _______ pairs of chromosomes, for a total of _______ chromosomes.

a)

10, 20

b)

25, 100

c)

23, 46

d)

46, 92

43.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
44.
What goes in box 3
a)
Aabb
b)
AABB
c)
AAbb
d)
aaBb
45.

What goes in box 15

a)

aabb

b)

AABB

c)

aaBB

d)

AAbb

46.
Cross Two Homozygous plants
(RRYY x rryy)
R = round seeds, r  = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds? 
a)
0%
b)
25%
c)
50%
d)
100%
47.
Using the dihybrid cross and key provided, what is the probability of the offspring being tall and white?
a)
9
b)
2
c)
3
d)
6
48.
In a dihybrid cross
a)
one trait is crossed.
b)
two traits are crossed.
c)
four boxes are needed for the punnett square.
d)
mom's alleles are dominant.
49.

Based off this punnett square, what fraction of the offspring will have wrinkled, yellow seeds?

a)

9/16

b)

3/16

c)

1/16

d)

16/16

50.

Based off this punnett square, what fraction of the offspring will have wrinkled, green seeds?

a)

9/16

b)

3/16

c)

1/16

d)

16/16

51.

What is the genotype for a pea plant homozygous for round seeds (R), and heterozygous for yellow seeds?

a)

RrYy

b)

RRyy

c)

RRYy

d)

rryy

52.

A white mouse with red eyes is crossed with a black mouse with brown eyes. The white mouse is recessive for both of its traits. The black mouse is dominant for both of its traits.

This cross would be

a)

BBEE x bbee

b)

BBEe x BbEe

c)

BbEE x BbEe

d)

BBee x BBEE

53.
What is another way of saying "purebred"?
a)
homozygous
b)
dominant
c)
recessive
d)
heterozygous
54.

What is the genotype for a pea plant homozygous for round seeds (R), and heterozygous for yellow seeds?

a)

RrYy

b)

RRyy

c)

RRYy

d)

rryy

55.

In horses, a straight mane (H) is dominant over a curly mane(h). Trotter horses (T) are dominant to pacer horses (t).


Determine the genotype of a horse with the phenotype: curly maned pacer horse

a)

HhTT

b)

hhTT

c)

hhtt

d)

HHtt

56.

In horses, a straight mane (H) is dominant over a curly mane(h). Trotter horses (T) are dominant to pacer horses (t).


Determine the genotype of a horse with the phenotype: homozygous dominant for both traits

a)

HhTT

b)

HHTT

c)

hhtt

d)

HHtt

57.

In horses, a straight mane (H) is dominant over a curly mane(h). Trotter horses (T) are dominant to pacer horses (t).


Determine the genotype of a horse with the phenotype: heterozygous for both traits

a)

HhTt

b)

HHTT

c)

hhtt

d)

HHtt

58.

In pea plants, purple flowers (P) are dominant to white flower (p). Round seeds (R) are dominant to wrinkled seeds (r).


Determine the phenotype of a flower with the genotype: Pprr

a)

Purple flower with wrinkled seeds

b)

Purple flower with round seeds

c)

White flower with wrinkled seeds

d)

White flower with round seeds

59.

In pea plants, purple flowers (P) are dominant to white flower (p). Round seeds (R) are dominant to wrinkled seeds (r).


Determine the phenotype of a flower with the genotype: ppRR

a)

Purple flower with wrinkled seeds

b)

Purple flower with round seeds

c)

White flower with wrinkled seeds

d)

White flower with round seeds

60.

In pea plants, purple flowers (P) are dominant to white flower (p). Round seeds (R) are dominant to wrinkled seeds (r).


Determine the phenotype of a flower with the genotype: PpRr

a)

Purple flower with wrinkled seeds

b)

Purple flower with round seeds

c)

White flower with wrinkled seeds

d)

White flower with round seeds

61.

In guinea pigs, short hair (H) is dominant to long hair (h). Also, black eyes (B) are dominant to red eyes (b).


Determine the genotype of a guinea pig with the phenotype: short hair with black eyes (select all possible genotypes)

a)

HHBb

b)

hhbb

c)

HhBB

d)

HHbb

62.

In guinea pigs, short hair (H) is dominant to long hair (h). Also, black eyes (B) are dominant to red eyes (b).


Determine the genotype of a guinea pig with the phenotype: long hair with red eyes.

a)

HHBb

b)

hhbb

c)

hhBB

d)

HHbb

63.

In guinea pigs, short hair (H) is dominant to long hair (h). Also, black eyes (B) are dominant to red eyes (b).


Determine the genotype of a guinea pig with the phenotype: short hair with red eyes (select all possible genotypes)

a)

HHbb

b)

Hhbb

c)

hhBB

d)

HHBb

64.

In cocker spaniels, a black coat color (B) is dominant to brown coat color (b). Also, curly hair (C) is dominant to straight hair (c).


Determine the phenotype of a cocker spaniel with the genotype: BbCc

a)

heterozygous for coat color and hair texture

b)

homozygous black coat with straight hair

c)

heterozygous coat color with homozygous curly hair

d)

homozygous brown coat with homozygous curly hair

65.

In cocker spaniels, a black coat color (B) is dominant to brown coat color (b). Also, curly hair (C) is dominant to straight hair (c).


Determine the phenotype of a cocker spaniel with the genotype: bbcc

a)

heterozygous for coat color and hair texture

b)

homozygous black coat with straight hair

c)

heterozygous coat color with homozygous curly hair

d)

homozygous brown coat with straight hair

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