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12th Biology Monthly Test -1 ( Zoology - Principles of Inheritance and Variation )

St. Britto Hr. Sec. School - Madurai

12th Biology Monthly Test -1 ( Zoology - Principles of Inheritance and Variation )-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

21^st trisomy is observed in

Down's syndrome
Patau's syndrome
Turner's syndrome
Klinefelter's syndrome

Scientists who contributed to karyotyping _______.

Tjio and Levan
John Cotto
Bridges
Wiener

The__________ is called null allele.

I^A
I^OI^B
I^O
I^BI^B

The ABO blood group was discovered by ________.

Sturli
Decastelle
Landsteiner
Alexander wiener

Sex chromatin is also called as _________.

polar body
nucleus
nucleolus
Barr body

Which of the following phenotypes is not possible in the progeny of the parental genotypic combination I^AI^O X I^AI^B?

AB
O
A
B

The allele I^o is called _______

Dominant allele
null allele
null allele
epistatic allele

ABO blood group in man is controlled by

Multiple alleles
Lethal genes
Sex linked genes
Y-linked genes

_________ proposed the existence of 8 alleles at a single Rh locus.

Fischer
Landsteiner
Bernstein
Wiener

Mangolism is a genetic disorder which is caused by the presence of an extra chromosome number

20
21
4
23

Trisomy 21 refers to ___________.

Patau's syndrome
Down's syndrome
Kline filters syndrome
Turners syndrome

Klinefelters’ syndrome is characterized by a karyotype of

XYY
XO
XXX
XXY

Which of the following is incorrect regarding ZW-ZZ type of sex determination?

It occurs in birds and some reptiles
Females are homogametic and males are heterogametic
Male produce two types of gametes
It occurs in gypsy moth

The ZO - ZZ type of sex determination is seen is _______.

moths
Reptiles
Human beings
Bugs

_________ is an inborn error of metabolism caused due to autosomal recessive gene.

Thalassemia
Albinism
Phenylketonuria
Huntington's chorea

The lygaeus type (XX - XY) type of sex determination is seen in ______

Fishes
Chickens
Human beings
Gypsy moth

Part - B

Generic 2 - Answer All Question

Write the symptoms of Patau's syndrome.

What is Rh factor or Rh antigen?

What is a syndrome?

Why are sex linked recessive characters more common in the male human beings?

Mention two measures under negative eugenics

What are holandric genes?

What is Lyonisation?

Distinguish between heterogametic and homogametic sex determination systems
What is haplodiploidy?

How does hemophilia affect an individual?

What is Lyon's hypothesis?

What are Gynandromorphy?

What is criss-cross inheritance?

Mention the symptoms seen in trisomy 13/ Pataus's syndrome.

Part - C

Generic 3 - Answer All Question

What is euthenics?

Defme Kin selection.

What is the chemical reaction that is affected in people suffering from Albinism?

What is Sex-switch gene?

'AB' Blood group individuals are called universal recipients. Justify

How can erythroblasts foetalis be prevented?

Females are carriers of Haemophilia. Give Reason.

What is erythoblastosis foetalis (or) Haemolytic disease of the new born (HDN)? (or) .Write about the incompatiability of Rh-factor.

What are Kappa particles.

Draw the symbols for
(a) Mating (b) Dizygotic twins.

Why are people with O blood group called as universal donors?

Part - D

Generic 5 - Answer All Question

What is colour Blindness? How X-linked gene inherited in the marriage between hemizygous recessive male and normal visioned woman?
What is extra chromosomal inheritance? Explain with an example

Explain the mode of sex determination in honeybees.

Write a note on thalassemia.

(i) Defirie Chromosomal Abnormality
(ii) Explain any two Autosomal Aneuploidy in human beings.

Discuss the methods adopted for the improvement of human race.

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