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Genetics Review

Total questions: 51

Worksheet time: 41mins

Name
Class
Date
1.
What do you call a section of DNA that codes for a specific trait?
a)
nucleus
b)
chromosome
c)
gene
d)
DNA
2.
How many chromosomes are found in human egg and sperm cells?
a)
20
b)
23
c)
26
d)
46
3.
------is the combination of two alleles that are different from one another.
a)
homozygous
b)
heterzygous
c)
phenotype
d)
trait
4.
The letters that make-up the genetic code for a trait
a)
genotype
b)
heterzygous
c)
phenotype
d)
trait
5.
---- Is the combination of two alleles that are the same
a)
genotype
b)
homozygous
c)
phenotype
d)
trait
6.
----is the type of gene that always shows itself when present
a)
genotype
b)
homozygous
c)
phenotype
d)
dominant
7.
The physical appearance of the allele combination the offspring receives
a)
genotype
b)
homozygous
c)
phenotype
d)
dominant
8.
Black fur (B) is dominant. Find the probability of a black offspring in a cross: bb x bb. 
a)
0%
b)
25%
c)
50%
d)
100%
9.

Look at the Punnett Square. What's the probability of having offspring displaying the recessive phenotype?

a)

100%

b)

75%

c)

50%

d)

25%

10.
What are the parents' genotypes?
a)
Homozygous for brown eyes
b)
Heterozygous for brown eyes
c)
Homozygous for blue eyes
d)
Heterozygous for blue eyes
11.
What is the phenotype for the recessive trait?
a)
brown eyes
b)
green eyes
c)
blue eyes
12.

A type of gene that can be hidden is by the dominant gene

a)

genotype

b)

recessive

c)

dominant

d)

allele

13.
A section of the DNA strand that determines a specific trait
a)
gene
b)
trait
c)
chromosome
d)
allele
14.
Sickle cell disease (abnormally shaped red blood cells) is a recessive disease in humans. Which gene combination(s) would result in someone being affected by sickle cell disease?
a)
SS
b)
ss
c)
Ss
15.
Tallness is dominant in pea plants and is represented by "T." What would the genotype be for a homozygous tall plant?
a)
Tt
b)
tt
c)
TT
d)
Tall 
16.
What is NOT a possible offspring genotype? 
a)
BB
b)
Bb
c)
bb
17.
Round seeds (R) are dominant to wrinkled seeds (r). What is the genotype for a wrinkled offspring?
a)
RR
b)
Rr
c)
rr
18.

What is the missing genotype?

a)

BB

b)

Bb

c)

bb

19.

What percentage of the offspring will have brown eyes?

a)

25%

b)

50%

c)

75%

d)

100%

20.

What is the phenotype in the top right square? (Yellow is dominant and green is recessive)

a)

yy

b)

Yy

c)

yellow

d)

green

21.
What % of the offspring in the Punnet square are heterozygous?
a)
25%
b)
50%
c)
75%
d)
100%
22.
What type of letters are used to show a trait is dominant?
a)
capital
b)
lowercase
23.

What are traits that aren't dominant over each other but whose heterozygous outcome is a combination of the two phenotypes?

a)

pure dominance

b)

incomplete dominance

c)

co-dominance

d)

simple dominance

24.
pp is an example of why type of genotype?
a)
homozygous recessive
b)
heterozygous recessive
c)
homozygous dominant
d)
heterozygous dominant
25.
PP is what type of genotype?
a)
homozygous recessive
b)
heterozygous recessive
c)
homozygous dominant
d)
homozygous recessive
26.
Pp is an example what type of genotype?
a)
homozygous recessive
b)
homozygous dominant
c)
heterozygous dominant
27.
What is one or more alternative forms of a gene?
a)
chromosome
b)
genotype
c)
phenotype
d)
allele
28.

The study of heredity

a)

genetics

b)

heredity

c)

chemistry

d)

botany

29.
Who was the father of genetics?
a)
Mendel
b)
Einstein
c)
Redi
d)
Pasteur
30.

What is the passing of traits from parent to offspring?

a)

heredity

b)

genetics

c)

evolution

d)

ecology

31.
If there is a cross of a red and white chicken, and the trait is co-dominant, what will be the result?
a)
a blended color
b)
a speckled chicken
32.

If red and white have co-dominance for a trait, and a red flower is crossed with a white flower, what will be the heterozygous phenotype?

a)

a red & white spotted flower

b)

a pink flower

33.
An inherited characteristic is knows as a(n):
a)
Pedigree
b)
Trait
c)
Chromatid
d)
Chromosome
34.
Makes up chromosomes that are in the nucleus:
a)
DNA
b)
PTC
c)
ATP
d)
LOL
35.
A change in DNA:
a)
Mutation
b)
Phenotype
c)
Genotype
d)
Albinism
36.
When gene pairs are written, the dominant allele is shown as a(n):
a)
D in front of it
b)
Capital Letter
c)
Bold letter
d)
Underlined letter
37.
The genetic makeup (allele combination) of an organism is called the:
a)
phenotype
b)
genotype
c)
probability
d)
heterozygous
38.
This is used to organize possible offspring combinations:
a)
probability
b)
Punnett square
c)
Mendel square
d)
Allele square
39.
The trait that is masked if the dominant allele is present:
a)
dominant
b)
recessive
c)
wimpy
d)
cool
40.
Which sex chromosomes do females have?
a)
XX
b)
XY
c)
AB
d)
BA
41.
Which sex chromosome do males have?
a)
XX
b)
XY
c)
AB
d)
BA
42.

Which of the following genotypes would lead to a recessive phenotype?

a)

EE

b)

Ee

c)

ee

43.

Which type of reproduction has one parent, and genetically identical offspring?

a)

Asexual reproduction

b)

Sexual reproduction

44.

If an organism has 15 chromosomes in its sex cells, how many chromosomes does it have?

a)

15

b)

30

c)

10

d)

45

45.

If a yellow pea plant is dominant to green, what percent of the offspring would be green if a hybrid yellow plant is crossed with a green plant?

a)

25%

b)

50%

c)

75%

d)

100%

46.

If purple flowers are dominant to white flowers, what cross would produce 25% white flowers?

a)

PP x pp

b)

PP X Pp

c)

Pp x pp

d)

Pp x Pp

47.

If wrinkled seeds is recessive to round seeds, what genotype would need to be crossed with a heterozygous round seed to produce the most wrinkled seeds?

a)

RR

b)

Rr

c)

rr

48.

If blindness is recessive in cats, what percent of offspring will be blind if a blind female cat has kittens with a purebred seeing male cat?

a)

0%

b)

25%

c)

50%

d)

75%

49.

Monster B and Monster G are both hybrid for red eyes (which is dominant to yellow eyes). What percentage of their offspring will have yellow eyes?

a)

0%

b)

25%

c)

50%

d)

75%

50.

If a 50% chance of having long eyelashes is desired and long eyelashes is recessive to short eyelashes, what would you need to cross with a hybrid short-eyelashed mouse?

a)

ss

b)

SS

c)

Ss

51.

DNA is a ________________ found in the ________________.

a)

double helix, cytoplasm

b)

single helix, nucleus

c)

double helix, nucleus

d)

single helix, cytoplasm