Human Genetics Test 1

Total Questions:50 Total Time: 60 Min

Remaining:

 

Questions 1 of 50

Question:Somatic cells of a human male contain single Barrbody, the genetic composition of the person would be.

Answers Choices:

X Y Y

X X Y

X O

X X X Y

Questions 2 of 50

Question:Edwards syndrome is an abnormality leading to mental deficiency caused by trisomy of chromosome number :

Answers Choices:

5

9

15

18

Questions 3 of 50

Question:To make a karyotype, chromosomes are photographed during:

Answers Choices:

Fertilization

Meiosis

Mitosis

Interphase

Questions 4 of 50

Question:The correct human chromosome number was first reported by:

Answers Choices:

Ford and Hammerton

Tjio and Levan

Painter and Flemming

Morgan and Bridges

Questions 5 of 50

Question:How many groups of chromosomes are found in human karyotype?

Answers Choices:

5

6

7

10

Questions 6 of 50

Question:Mongolism. Patau's syndrome and Edward's syndrome are due to:

Answers Choices:

Allosomal abnormalities

Autosomal abnormalities

Both (1) and (2)

None of these

Questions 7 of 50

Question:Which of the following diseases is due to deletion of chromosome?

Answers Choices:

Cat Cry syndrome

Patau's syndrome

Edward's syndrome

Down's syndrome

Questions 8 of 50

Question:Philadelphia chromosome is reported in patients suffering from:

Answers Choices:

Kidney stone

Liver disfunction

Leukemia

Insomnia

Questions 9 of 50

Question:The chromosomal complement in a human zygote destined to develop into a female is:

Answers Choices:

44 + XY

22A + X

23 pairs of autosomes

44 +XX

Questions 10 of 50

Question:In man. sex determination depends upon chromosomes present in:

Answers Choices:

male and female gametes

male gametes

female gametes

none of these

Questions 11 of 50

Question:Human offspring will be female if 23rd pair of chromosomes in the zygote is:

Answers Choices:

XYY

YY

XY

XX

Questions 12 of 50

Question:Gynandromorphs arc:

Answers Choices:

half male and half female

male with female character

female with male character

none of these

Questions 13 of 50

Question:When an animal has both the characters of male and female, it is called:

Answers Choices:

Intersex

Gynandromorph

Super-female

Super-male

Questions 14 of 50

Question:During organ differentiation in Drosophila, an organ is often modified to another organ such as wings could be replaced by legs. Genes responsible for such metamorphosis are called:

Answers Choices:

plasmid genes

homeotic genes

complementary genes

double dominant genes

Questions 15 of 50

Question:Who has first described 'Criminal syndrome'?

Answers Choices:

Levan

Sandberg

Turner

Lejeune

Questions 16 of 50

Question:Barr body in mammals represents:

Answers Choices:

all the heterochromatin in female cells

one of the two X-chromosomes in the somatic cells of females

all the heterochromatin in male and female cells

the Y-chromosome in the somatic cells of male

Questions 17 of 50

Question:One Barr body is found in a man of genotype:

Answers Choices:

XY

XXXY

XX

XXY

Questions 18 of 50

Question:Who studied sex-linked inheritance for the first time?

Answers Choices:

Pasteur

Morgan

Mendel

Khorana

Questions 19 of 50

Question:Normally, sex-linked genes are located in X-chromosomes in human beings. This indicates that:

Answers Choices:

X-chromosome is dominant over Y-chromo­some

X-chromosome is longer than Y-chromo­some

Y-chromosome is longer than X-chromo­some

entire set of genes in X-chromosome is different from that in Y-chromosome

Questions 20 of 50

Question:Colour blindness is caused by a single:

Answers Choices:

dominant gene in man

dominant gene in woman

recessive gene in woman

recessive gene in man

Questions 21 of 50

Question:Daughter suffers from colour blindness and son is normal. It is possible if:

Answers Choices:

mother is carrier, father suffering from CB

father is normal, mother suffering from CB

mother and father normal

father and mother suffering from CB

Questions 22 of 50

Question:Colour blindness is related with defect in:

Answers Choices:

rods

cones

both of these

none of these

Questions 23 of 50

Question:A colour blind girl is rare because she will be born only when:

Answers Choices:

Parents have normal vision but grandparents were colour blind

Her mother is colour blind and father has normal vision

Her mother and maternal grandfather were colour blind

Her father and maternal grandfather were colour blind

Questions 24 of 50

Question:A colour blind man has a colour blind sister but normal brother. The phenotypes of parents are:

Answers Choices:

Both parents are normal

Both parents are colour blind

Normal father and colour blind mother

Mother carrier and father colour blind

Questions 25 of 50

Question:A phenotypically normal couple has two normal daughters and a son affected with haemophilia. What is the probability that both the daughters are heterozygous carriers?

Answers Choices:

0%

25%

50%

100%

Questions 26 of 50

Question:A haemophilia is more common in males because it is a:

Answers Choices:

recessive trait carried by Y-chromosome

dominant trait carried by Y-chromosome

recessive trait carried by X-chromosome

dominant trait carried by X-chromosome

Questions 27 of 50

Question:Of a normal couple, half the sons are haemophilic while half the daughters are carriers. The gene is located on:

Answers Choices:

Y-chromosome of father

one X-chromosome of mother

X-chromosome of father

both the X-chromosomes of mother

Questions 28 of 50

Question:Genes which are confined to differential region of Y-chromosome only are called:

Answers Choices:

holandric

mutant

completely sex-linked

autosomal

Questions 29 of 50

Question:A man who carries holandric gene in his Y-chromosome marries a normal woman. The said gene will be transmitted to:

Answers Choices:

50% of their sons

50% of their daughters

All their daughters

All their sons

Questions 30 of 50

Question:Donors and recipients in a blood transfusion process can be:

Answers Choices:

only father and son

only brother and sister

only maternal uncle and niece

all the above

Questions 31 of 50

Question:In which blood group antibodies are absent?

Answers Choices:

A

AB

B

O

Questions 32 of 50

Question:The possible blood groups of the offsprings of the parents with blood group O and AB:

Answers Choices:

A and B

A, B and AB

O and AB

O, A, B and AB

Questions 33 of 50

Question:Apart from its importance in blood transfusion, study of blood groups is also useful in:

Answers Choices:

personality

settling paternal disputes

both (1) and (2)

none of these

Questions 34 of 50

Question:Which of the following would result in haemo­lysis in foetus?

Answers Choices:

Rh incompatibility

AB incompatibility

AO incompatibility

BO incompatibility

Questions 35 of 50

Question:Erythroblastosis foetalis occurs when:

Answers Choices:

Husband is \(R{h^ - }\) and wife is \(R{h^ - }\)

Husband is \(R{h^ + }\) and wife is \(R{h^ + }\)

Husband is \(R{h^ - }\) and wife is \(R{h^ + }\)

Husband is \(R{h^ + }\) and wife is \(R{h^ - }\)

Questions 36 of 50

Question:Albinism is a congenital disorder resulting from the lack of the enzyme:

Answers Choices:

tyrosinase

catalase

xanthine oxidase

melanase

Questions 37 of 50

Question:A normal woman whose father was albino marries an albino; what proportion of normal and albino can be expected among their offspring?

Answers Choices:

two normal : one albino

one normal : one albino

all normal

all albino

Questions 38 of 50

Question:Gaucher's disease is associated with abnormal metabolism of:

Answers Choices:

Fat

Carbohydrate

Protein

Nucleic acid

Questions 39 of 50

Question:The process of improving human race genetically is called:

Answers Choices:

Eugenics

Euthenics

Euphenics

All of these

Questions 40 of 50

Question:A child of ten years is as intelligent as is normally expected in the child of fourteen years. IQ of this child would be:

Answers Choices:

140

100

160

110

Questions 41 of 50

Question:Mental competence in relation to chronological age in man is called:

Answers Choices:

Idiocy

Diligence

Intelligence

Intelligence quotient

Questions 42 of 50

Question:If the mental age of a 6 years old child is 4, his mental age when he will be 15 years old should be:

Answers Choices:

8

9

12

10

Questions 43 of 50

Question:In Down's syndrome, karyotyping has shown that the disorder is associated with trisomy of chromosome number 21 usually due to:

Answers Choices:

nondisjunction during egg formation

nondisjunction during sperm cell forma­tion

addition of extra chromosome during cleavage of zygote

nondisjunction during egg cells production and sperm production

Questions 44 of 50

Question:Mental retardation in man associated with sex chromosomal abnormality is usually due to:

Answers Choices:

increase in the number of X-chromosome

increase in the number of Y-chromosome

increase in the size of X-chromosome

increase in the size of Y-chromosome

Questions 45 of 50

Question:A haemophilic man marries a normal homozygous woman. What will be the probability of his sons to be haemophilic?

Answers Choices:

0%

25%

50%

100%

Questions 46 of 50

Question:When released from ovary human egg contains:

Answers Choices:

One X-chromosome

One Y-chromosome

Two X-chromosomes

XY-chromosomes

Questions 47 of 50

Question:Human syndromes arise due to chromosomal abnormalities. Which one of the following is resultant of monosomic condition?

Answers Choices:

Down's syndrome

Turner's syndrome

Edward's syndrome

Klinefelter's syndrome

Questions 48 of 50

Question:The person with Turner's syndrome has:

Answers Choices:

44 autosomes and XO sex chromosomes

44 autosomes and XXY sex chromosomes

44 autosomes and XYY sex chromosomes

44 autosomes and XXX sex chromosomes

Questions 49 of 50

Question:The offsprings produced through which of the following processes are not exactly similar to their parents?

Answers Choices:

sexual reproduction

dizygotic twins

asexual reproduction

parthenogenesis

Questions 50 of 50

Question:Transfer of DNA from bacterium to another through cell to cell contact is known as:

Answers Choices:

conjugation

transduction

transcription

transformation