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Year 10 biology genetics

Total questions: 52

Worksheet time: 39mins

Name
Class
Date
1.

Which of the following is homozygous recessive

a)

Rr

b)

RR

c)

rr

d)

all of them

2.
The yellow part of this picture is DNA. What do you think the turquoise part around it is?
a)
chromosome
b)
gene
c)
DNA
d)
ACTG
3.
What is a gene?
a)
A bundle (like a hot dog bun) that the DNA is packed into
b)
something inside the nucleus
c)
a piece of DNA
d)
all of your DNA
4.
What is the human genome?
a)
a piece of DNA
b)
a chromosome
c)
all of your cells
d)
all of your DNA
5.
The twisted ladder shape of DNA is referred to as a ....
a)
Twizzler candy
b)
twisted ladder
c)
double helix
d)
yo mama
6.
A chromosome is best described as a
a)
gene that has more than one form.
b)
green cell found in many plants.
c)
strand of DNA containing genetic information.
d)
reproductive cell found in certain kinds of bacteria
7.

Every organism has a genotype and a phenotype.

a)

True

b)

False

c)

True today, false tomorrow

d)

IDK

8.

Genotype and phenotype mean the same thing.

a)

True

b)

False

c)

Who knows?

d)

Who cares?

9.
The physical appearance of an organism based on traits
a)
Genotype
b)
Phenotype
c)
Meiosis
d)
Genetics
10.
describe the difference between genotype and phenotype
a)
Genotype is dominant and phenotype is recessive
b)
genotyme is the alleles and phentype is the physical appearance
c)
genotype is homozygous and phenotype is hybrid and genotype is purebred
d)
genotype is sex linked and pheontype is pheontype is not
11.
In the allele that each parent will pass to the offspring is based on probability.
a)
true
b)
false
12.
Why do cells do mitosis?
a)
To meet egg and sperm
b)
To repair the cell
c)
to help grow
d)
Both the 2 and 3 option
13.

What kind of cells are made in MEIOSIS?

a)

Haploid Gametes

b)

Diploid Somatic Cells

c)

Skin Cells

d)

Liver Cells

14.

A human body (somatic) cell usually has how many chromosomes?

a)

6

b)

22

c)

4

d)

46

15.
The cells produced via meiosis are called:
a)
sex cells
b)
somatic cells
c)
body cells
d)
skin cells
16.
Why do we need meiosis?
a)
To double the number of chromosomes going into sex cells
b)
To halve the number of chromosomes going into sex cells
c)
To triple the number of chromosomes going into sex cells
d)
To not change the number of chromosomes going into sex cells
17.
What causes genetic variation in meiosis?
a)
chromosomes lining up
b)
crossing over of chromosomes
c)
separation of chromosomes
d)
chromosomes pulling apart
18.

Mitosis is essential for the growth and development of multi cellular organisms(e.g plants and animals)

a)

True

b)

False

19.

Mitosis happens during asexual reproduction

a)

True

b)

False

20.

Gametes are made by a type of cell division called meiosis

a)

True

b)

False

21.

Asexual reproduction only involves mitosis.

a)

True

b)

False

22.
Structure (b) is a ____.
a)
chromosome
b)
chromatid
c)
centromere
23.
The result of meiosis is:
a)
two diploid cells
b)
two haploid cells
c)
four diploid cells
d)
four haploid cells
24.
products of meiosis are genetically
a)
different
b)
identical
25.

Which option below best completes this sentence:

Genetic variation refers to

a)

the presence of genetic similarities between individuals

b)

the presence of genetic differences between individuals

c)

similarities in the DNA sequence between individuals

d)

differences in alleles between individuals

26.
a)

INCREASES GENETIC VARIATION

b)

TAKES PLACE IN PROPHASE I

c)

CROSSING OVER

d)

ALL ARE TRUE

27.

MEIOSIS

a)

REDUCES THE NUMBER OF CHROMOSOMES BY ONE HALF

b)

PRODUCES UNIQUE SEX CELLS-1N

c)

ALLOWS TRAITS TO BE PASSED TO OFFSPRING

d)

ALL ARE TRUE

e)

INCREASE GENETIC VARIATION

28.

MEIOSIS PRODUCES 4 CELLS, THEY ARE

a)

N

b)

2N

c)

3N

29.

Which of the following is the best definition for MEIOSIS?

a)

the process of two haploid cells uniting

b)

the counting of chromosomes within a diploid cell

c)

a two-step process that reduces the number of chromosomes in half such that there is only one copy of all the chromosomes

d)

the equational division of a cell into two identical copies

30.

A phenotype is

a)

Dominance

b)

Physical appearance

c)

Recessiveness

d)

Letter Combinations

31.

Aa, DD, Bb, yy are all examples of _______

a)

genotypes

b)

phenotypes

32.

If something is heterozygous, it is also _____

a)

purebred

b)

hybrid

c)

dominant

d)

recessive

33.

If something is homozygous, it can also be called____

a)

phenotype

b)

genotype

c)

hybrid

d)

purebred

34.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
35.
If B = brown hair and b = blonde hair, what is the probability of brown hair?
a)
25%
b)
50%
c)
0%
d)
75%
36.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
a)
0 %
b)
25%
c)
50%
d)
75%
37.
What ratio of the offspring from the cross shown will be homozygous recessive for the  trait of tallness? 
a)
0 in 4
b)
1 in 4
c)
2 in 4
d)
4 in 4
38.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
39.

A mother carries the gene for haemophilia yet she doesn't show the phenotype. Therefore, the gene for haemophilia is

a)

Dominant

b)

Recessive

c)

Co-dominant

d)

Incomplete dominance

40.

What is the chance a mother who is a carrier for colour blindness and a colourblind father will have colourblind offspring?

(Hint: Draw a punnet square)

a)

25%

b)

50%

c)

75%

d)

100%

41.

Sex-linked genetically inherited traits:

a)

can appear in both males and females

b)

are only found in males

c)

are only found in females

d)

only appear during winter months

42.

Y-linked genes are expressed in

a)

males

b)

females

c)

both male and female

d)

50% of males and females

43.

If a gene is found only on the X chromosome and not the Y chromosome, it is said to be

a)

sex-linked trait

b)

polygenic trait

c)

codominant trait

d)

incomplete dominance trait

44.

XX

a)

female

b)

male

45.

Who is more likely to inherit and be affected by sex-linked disorders?

a)

Males

b)

Females

c)

Equal chances

46.

If hemophilia is an X-linked recessive disorder, what genotype would a carrier female have?

a)

XH XH

b)

XH Xh

c)

Xh Xh

47.

If hemophilia is an X-linked recessive disorder, what genotype would a normal male have?

a)

XH XH

b)

XH Y

c)

Xh Xh

d)

Xh Y

48.

In a sex-linked dominant trait, which of the following would NOT have the trait?

a)

XH Xh

b)

Xh Xh

c)

XH Y

d)

XH XH

49.
Which gender can be carriers of colorblindness and not have it?
a)
Just males
b)
Just females
c)
Both genders
50.
Why do all the daughters in Generation II carry the colorblind gene?
a)
Because mom passed on the gene.
b)
Because dad passed on the X chromosome.
c)
Because their brother has it.
d)
Because their brother gave it to them.
51.
If this pedigree shows a recessive disorder, what MUST the genotype of individual II-3 be?
a)
HH
b)
Hh
c)
hh
d)
None of the above
52.

Why does individual IV-7 have colorblindness?

a)

Because his mum is a carrier.

b)

Because his dad has it.

c)

Because his siblings have it.

d)

Because his uncle has it.

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