Human Genetics Test 4

Total Questions:50 Total Time: 60 Min

Remaining:

 

Questions 1 of 50

Question:The twenty third pair of chromosomes in man is known as :

Answers Choices:

Chromatid

Heterosome

Autosome

Gene

Questions 2 of 50

Question:Edward's syndromes, Pa tau's syndromes and Down's syndromes" are due to :

Answers Choices:

Change in sex chromosome

Change in Autosome

Change in both sex chromosome and autosome

Mutation due to malnutrition

Questions 3 of 50

Question:In mongolism, a patient shows:

Answers Choices:

Monosomy

Nullisomy

Trisomy

Barr body

Questions 4 of 50

Question:Chromosome number of Down's syndrome is:

Answers Choices:

23

45

46

47

Questions 5 of 50

Question:XY sex chromosomes were discovered by:

Answers Choices:

Nettie Stevens

Robert Brown

M.J.D. White

Gregor Johann Mendel

Questions 6 of 50

Question:A girl receives her X-chromosome from:

Answers Choices:

her father only

her mother only

both father and mother

extranuclear DNA from her mother's egg

Questions 7 of 50

Question:A couple has five daughters but no son. The probability of son as the sixth child will be:

Answers Choices:

0%

25%

50%

100%

Questions 8 of 50

Question:Balance theory of sex determination holds good for:

Answers Choices:

Humans

Drosophila

Grasshoppers

Allium cepa

Questions 9 of 50

Question:The number of X-chromosomes in Turner's syndrome is:

Answers Choices:

3

2

1

0

Questions 10 of 50

Question:In humans, male XXY and female XXXX occur due to:

Answers Choices:

euploidy

aneuploidy

autosomal syndrome EH

none of these

Questions 11 of 50

Question:Foetal sex can be determined by examining cells from amniotic fluid looking for:

Answers Choices:

Kinetochore

Chiasmata

Chromosomes

Barr bodies

Questions 12 of 50

Question:A woman has a child with Klinefelter's syndrome. How many Barr bodies the child possesses?

Answers Choices:

One

Two

Three

None

Questions 13 of 50

Question:A single recessive trait which can express its effect should occur on:

Answers Choices:

X-chromosome of male

X-chromosome of female

Any chromosome

Any autosome

Questions 14 of 50

Question:A cross between white-eyed female and red-eyed male Drosophila gives red-eyed females and white-eyed males. Rarely the cross gives rise to white-eyed females and red-eyed males. This is due to:

Answers Choices:

Mutation in male

Loss of a sex chromosome

Mutation in female fly

Nondisjunction of two X-chromosomes in female

Questions 15 of 50

Question:A sex linked recessive gene 'c' produces red-green colour blindness in human beings. A normal woman whose father was colour blind marries a colour blind man. Of all the girls born to these parents what percentage is expected to be colour blind?

Answers Choices:

25%

75%

100%

50%

Questions 16 of 50

Question:Haemophilia is:

Answers Choices:

recessive for X-chromosomes

recessive for Y-chromosomes

both (1) and (2)

autoimmune disease

Questions 17 of 50

Question:Given is: X is the chromosome with gene for haemophilia. X is the chromosome with gene for normal blood clotting. Which of the following individuals will act as carrier for haemophilia?

Answers Choices:

XY

xY

Xx

xx

Questions 18 of 50

Question:Haemophilia is a genetic disorder in which:

Answers Choices:

blood count falls

blood clots form in blood vessels

there is delayed coagulation of blood

blood fails to coagulate after an injury

Questions 19 of 50

Question:A man is haemophilic. It indicates that he:

Answers Choices:

has little amount of blood

is carrying a blood parasite

has inherited this condition from father

has inherited this condition from mother

Questions 20 of 50

Question:Inheritance of ABO blood groups illustrates:

Answers Choices:

Multiple allelism

Polyploidy

Incomplete dominance

None

Questions 21 of 50

Question:Blood group with antigen A and antibody B is:

Answers Choices:

A

AB

B

O

Questions 22 of 50

Question:A boy of blood group 'O' has mother with blood group 'A' and father 'B' How many of their children have the same group as boy?

Answers Choices:

4 out of 4

2 out of 4

1 out of 4

3 out of 4

Questions 23 of 50

Question:A man of 'A' blood group marries a woman of 'AB' blood group. Which type of progeny would indicate that man is heterozygous?

Answers Choices:

O

A

B

AB

Questions 24 of 50

Question:In human beings, multiple allelism controls inheritance of:

Answers Choices:

sickle-cell anaemia

colour blindness

phenylketonuria

blood groups

Questions 25 of 50

Question:If a mother has blood group B, father has A group the offspring can be:

Answers Choices:

A group

O group

AB group

Any of the group

Questions 26 of 50

Question:A man with blood group 'B' marries a woman with blood group 'A' and their first child is having blood group B. What is the genotype of the child?

Answers Choices:

\({I^O}{I^B}\)

\({I^B}{I^B}\)

\({I^A}{I^B}\)

\({I^O}{I^A}\)

Questions 27 of 50

Question:Rh factor is present in:

Answers Choices:

All reptiles

All mammals

All vertebrates

Man and Rhesus monkey only

Questions 28 of 50

Question:Which of the following is a dominant trait?

Answers Choices:

Rh factor

Haemophilia

Colour blindness

Albinism

Questions 29 of 50

Question:Twins are born because:

Answers Choices:

two sperms fertilize two ova

two sperms fertilize four ova

two sperms fertilize single ovum from two sites

none of these

Questions 30 of 50

Question:Free-Martin is an example of:

Answers Choices:

sex reversal

transformer gene

hormonal control of sex

both (1) and (3)

Questions 31 of 50

Question:In Free-martin condition:

Answers Choices:

female is sterile and male is normal

male is sterile and female is normal

both female and male are sterile

both female and male are normal

Questions 32 of 50

Question:An example of molecular mutation is:

Answers Choices:

Anaemia

Erythroblastosis foetalis

Sickle-cell anaemia

Haemophilia

Questions 33 of 50

Question:Genotype of a person with 'Sickle-cell trait' is:

Answers Choices:

\(H{b^A}H{b^s}\)

\(H{b^A}H{b^A}\)

\(H{b^s}H{b^s}\)

None

Questions 34 of 50

Question:Which one of the following is a genetic trait?

Answers Choices:

Thalassemia

Parkinson's disease

Cushing's syndrome

Grave's disease

Questions 35 of 50

Question:The term 'Eugenics' was coined by:

Answers Choices:

Lederberg

Urey

Francis Galton D

Thomas Hunt Morgan

Questions 36 of 50

Question:Marriages between close relatives should be avoided because it induces more:

Answers Choices:

blood group abnormalities

mutations

recessive alleles to come together

multiple births

Questions 37 of 50

Question:Intelligence quotient (IQ) is a ratio of mental age to:

Answers Choices:

chronological age

chronological age multiplied by 10

chronological age divided by 100

chronological age multiplied by 100

Questions 38 of 50

Question:Restriction enzymes are used in genetic engineering because:

Answers Choices:

they cut DNA at specific base sequence

they are proteolytic enzymes which can degrade harmful proteins

they are nucleases that cut DNA at variable sites

they can join different DNA fragments

Questions 39 of 50

Question:Restriction endonuclease is used for cutting:

Answers Choices:

mRNA

RNA fragment

double strand DNA

single strand DNA

Questions 40 of 50

Question:Plasmids are:

Answers Choices:

outgrowths of cell membrane

ingrowths of mitochondria

extrachromosomal circular material

outgrowths of nuclear membrane

Questions 41 of 50

Question:Plants having similar genotypes produced by plant breeding are called:

Answers Choices:

haploid

autoploid

genome

clone

Questions 42 of 50

Question:Genes which confer antibiotic resistance on bacteria are located on:

Answers Choices:

polysome

RNA

circular DNA molecule

plasmid

Questions 43 of 50

Question:Which marriage is not suitable from heredity point of view?

Answers Choices:

Man \(R{h^ + }\) woman \(R{h^ - }\)

Man \(R{h^ - }\), woman \(R{h^ + }\)

Both \(R{h^ + }\)

Both \(R{h^ - }\)

Questions 44 of 50

Question:In which blood group are antigens absent?

Answers Choices:

A

B

O

AB

Questions 45 of 50

Question:Red-green colour blindness in humans is governed by sex-linked recessive gene. A normal woman whose father was colour blind marries a colour blind man. What proportion of their daughters is expected to be colour blind?

Answers Choices:

04/Jan

All

3/4

1/2

Questions 46 of 50

Question:During blood typing agglutination indicates that the:

Answers Choices:

RBC carry certain antibodies

plasma contains certain antibodies

RBC carry certain antigens

plasma contains certain antigens

Questions 47 of 50

Question:In case of haemophilia, if the carrier daughter (Hh) marries a normal man 'H', then among their daughters:

Answers Choices:

50% will be normal (HH) and 50% earner (Hh)

50% will be normal (HH) and 50% hemo­philic (h)

50% will be carrier (Hh) and 50% hemo­philic (h)

25% will be carrier (Hh) and 75% hemo­philic (h)

Questions 48 of 50

Question:The probability of the male child of a haemophilic father and normal mother becoming haemophilic is:

Answers Choices:

0%

25%

50%

100%

Questions 49 of 50

Question:A woman with blood group A marries a man with blood group B, the possible group of offsprings is:

Answers Choices:

A, B

A, B, O

A, B, AB, O

A, AB, B

Questions 50 of 50

Question:A person may have one gene for adult haemoglobin and one gene for sickle-cell haemoglobin. This heterozygous condition is called:

Answers Choices:

genome

anaemia

gene trait

sickle-cell trait