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Heredity: Fundametals of Genetics

Total questions: 40

Worksheet time: 45mins

Name
Class
Date
1.

..................... is the transimission of qualities or characters from one generation to the next.

a)

Heredity

b)

Genetics

c)

Hybridization

d)

Mutation

2.

Genetics disorder is caused by

a)

dominant allele

b)

recessive allele

c)

mutation

d)

genetic variation

3.

Factors that control traits are called

a)

gene

b)

dominant allele

c)

true bredding

d)

DNA

4.

An organism's physical appearnce is its

a)

genotype

b)

allele

c)

phenotype

d)

trait

5.

Different form of a gene is called

a)

alleles

b)

factors

c)

traits

d)

characters

6.

An organism's genotype is its

a)

genetic make up

b)

feather color

c)

physical appearance

d)

stem height

7.

An organism that has two identical allele for a trait is

a)

dominant

b)

recessive

c)

homozygous

d)

heterozygous

8.

A heterozygous organism has

a)

three differnt alleles for a trait

b)

two identical alleles for a trait

c)

only one allele for a trait

d)

two different alleles for a trait

9.

Which combination of sex chromosomes results in male human being?

a)

XX

b)

YY

c)

XY

d)

either XX or YY

10.

A carrier is a person who has

a)

one recessive and one dominant allele for a trait

b)

two recessive alleles for a trait

c)

two dominant alleles for a trait

d)

more than two allele for a trait

11.

Gregor Mendel is known as the father of

a)

gene

b)

genetics

c)

hybridization

d)

mutation

12.

There are ............. phases in mitotic cell division.

a)

3

b)

4

c)

5

d)

6

13.

What is genetics? (2marks)

4 lines
14.

What happen during prophase of mitosis?

4 lines
15.

Gene is a segment of DNA.

a)

True

b)

False

16.

............... carries heredity instruction for producing proteins.

a)

DNA

b)

RNA

c)

Gene

d)

Chromosome

17.

Which of the following make human different in its characteristics?

a)

Hybridization

b)

Genetic variation

c)

Mutation

d)

Heterozygous

18.

Mule is an offspring of a male donkey and a female horse as the result of ............

a)

mutation

b)

hybirdization

c)

gene mutation

d)

genetic variation

19.

What does the notation "Tt" mean to geneticists?

a)

Two dominant alleles

b)

Two recessive alleles

c)

At least one recessive allele

d)

One dominant and one recessive allele

20.

Two ........... will result in your appearance.

a)

gene

b)

recessive alleles

c)

dominant alleles

d)

heterozygous allele

21.

The gene symbol for Red is RR.

a)

True

b)

False

22.

The idea that for any particular trait, the pair of alleles for each parent separate and only one allele from each parent passes to an offspring is Mendel law of

a)

dominance

b)

segregation

c)

independent assortment

d)

none of the above

23.

Mendel's establsih this law in contrasting two pair of contrasting characters.

a)

Mendel's law of domance

b)

Mendel's law of segreation

c)

Mendel's law of independent assortment

d)

All of the above

24.

Human has 23 chromosmes.

a)

True

b)

False

25.

All human beings has 22 pairs of autosomal chromosomes and 1 pair of sex chromosomes.

a)

True

b)

False

26.

Every chromosomes pair of the somatic cell are alike.

a)

True

b)

False

27.

What is a somatic cell? (1 mark)

4 lines
28.

Reproductive cell gets only one sex chromosome as a result of meoisis.

a)

True

b)

False

29.

What is fertilization? (2 marks)

4 lines
30.

Define DNA? (2 marks)

4 lines
31.

DNA is composed of which of the following molecules?

a)

FIve carbon sugar

b)

Phosphate group

c)

Nitrogen containing base

d)

All of the above

32.

Pyrimidines consist of two molecules called cytosine and guanine.

a)

True

b)

False

33.

Nitrogenous bases of adenine always pair with thymine.

a)

True

b)

False

34.

X - linked inheritance disorders are commonly occur in female and Y-linked disorders are commonly occur in male.

a)

True

b)

False

35.

In cross of a white eyed female fruit fly and red eye male, what percent of the female offspring will have white eye? ( White eyes are X-linked, recessive)

a)

0%

b)

25%

c)

50%

d)

100%

36.

Hemophilia is a recessive sex-linked disease on the X chromosome in human. What is the genotype of a woman with hemophilia?

a)

XX

b)

XhXhX^hX^h

c)

XhXX^hX

d)

XHXHX^HX^H

37.

Cross a homozygous dominant and a homozygous recessive of a round yellow seed. How many round, yellow seed will be produced there?

a)

9/16

b)

16/16

c)

3/16

d)

1/16

38.

Hornless (H) in cattle is dominant over horned (h). A homozygous hornless bull is mated with a homozygous horned cow. What will be the phenotype of the first generation?

a)

100% hornless

b)

100% horned

c)

50%hornless

d)

50% horned

39.

Why does the Punnett square is used to calculate the ratio of the offspring? (2 marks)

4 lines
40.

Babies with down syndrown have an extra copy of one of these chromosomes.

a)

Chromosome 23

b)

Chromosome 21

c)

Chromosome 12

d)

Chromosome 24

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