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Genetics and Inheritance

Total questions: 22

Worksheet time: 28mins

Name
Class
Date
1.

Alternative forms of a gene at a particular position on homologous chromosomes are called:

a)

Alleles

b)

Chromosomes

c)

Locus

d)

Hyprids

2.

An organism that has two of the same alleles for a particular genetic characteristic is called:

a)

Homozygous

b)

Heterozygous

c)

Hybrid

d)

Dominant

3.

An organism that has two different alleles for a particular genetic characteristic is called:

a)

Heterozygous

b)

Homozygous

c)

Recessive

d)

Pure-bred

4.

The allele that is expressed in the heterozygous condition is called the (a)   allele.

5.

The allele that is only expressed if the dominant allele is absent is called the (a)   allele.

6.

The physical or observable characteristics of an organism which are determined by its genetic make-up as well as the environment in which it lives is called the _____________.

a)

Phenotype

b)

Genotype

c)

Dominant Allele

d)

Recessive Allele

7.

Genetic variation can result from:

a)

Crossing over and random segregation during meiosis

b)

Mutations

c)

Random fusion of gametes during fertilisation

d)

Influence of the environment

e)

Splitting of cells during mitosis

8.

The scientist known as the 'father of genetics' is _____________________.

a)

Gregor Mendel

b)

Rosalind Franklin

c)

James Watson

d)

Francis Crick

9.

In a case of complete dominance within pea plants, if the tall allele is dominant and the short allele is recessive, the offspring of the pea plants will be ________________.

a)

Tall in hight

b)

Short in hight

c)

Medium in hight

d)

No clear outcome

10.

In a case of incomplete dominance within pea plants, if a red-flowered plant is crossed with a blue-flowered plant, the offspring of the pea plants will have ________________.

a)

Red Flowers

b)

Blue Flowers

c)

Purple Flowers

d)

Flowers with red and blue patches

e)

A mixture of some red and some blue coloured flowers

11.

In a case of co-dominance within pea plants, if a yellow-flowered plant is crossed with a white-flowered plant, the offspring of the pea plants will have ________________.

a)

Yellow flowers

b)

White flowers

c)

A mixture of some yellow and some white flowers

d)

Flowers spotted with both yellow and white

12.

In the case of dihybrid crossing within pea plants, if a recessive purple-flowered, recessive tall plant is crossed with a dominant white-flowered, dominant short plant, the offspring of the pea plants will be ________________.

a)

White-flowered and short

b)

Purple-flowered and tall

c)

White-flowered and tall

d)

Purple-flowered and short

e)

A mixture of both white and purple flowers with some tall and some short plants

13.

If "A" represents the gene for white flowers and "a" represents the gene for red flowers, what is the probability of these two plant's offspring having red flowers?

a)

0%

b)

25%

c)

50%

d)

100%

14.

If "A" represents the gene for yellow flowers and "a" represents the gene for pink flowers, what is the probability of these two plant's offspring having yellow flowers?

a)

0%

b)

25%

c)

50%

d)

100%

15.

The pair of chromosomes that determine sex-linked traits are the ________.

a)

21st pair

b)

23rd pair

c)

24th pair

d)

46th pair

e)

13th pair

16.

Sex-linked traits in humans do NOT include:

a)

Haemophilia

b)

Colour blindness

c)

Hight

d)

Eye colour

17.

The image shows an example of ______________ mutation.

a)

Substitution

b)

Deletion

c)

Addition

18.

Mutations can be classed as:

a)

Harmful

b)

Harmless

c)

Useful

d)

Harmless, harmful or useful

e)

Harmless or harmful

19.

List TWO benefits of genetically modifying crops:

4 lines
20.

List ONE disadvantage of genetically modifying crops:

4 lines
21.

The production of genetically identical offspring by implanting a cloned embryo into the uterus of a surrogate mother is called ________________________.

a)

Reproductive cloning

b)

Therapeutic cloning

c)

Stem cell cloning

d)

Asexual cloning

22.

The production of cells that exactly match the cells of a patient is called _________________________.

a)

Reproductive cloning

b)

Therapeutic cloning

c)

Stem cell cloning

d)

Asexual cloning