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

St. Britto Hr. Sec. School - Madurai

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

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

ZW-ZZ system of sex determination occurs in

Fishes
Reptiles
Birds
All of these

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

Which of the following is not correct?

Three or more alleles of a trait in the population are called multiple alleles
A normal gene undergoes mutations to form many alleles
Multiple alleles map at different loci of a chromosome
A diploid organism has only two alleles out of many in the population

Which of the following is true about Rh factor in the offspring of a parental combination DdXDd (both Rh positive)?

All will be Rh-positive
Half will be Rh positive
About ¾ will be Rh negative
About one fourth will be Rh negative

The blood group _________ is called universal recipient.

O
AB
B
A

In an accident there is great loss of blood and there is no time to analyse the blood group which blood can be safely transferred?

‘O’ and Rh negative
‘O’ and Rh positive
'B’ and Rh negative
‘AB’ and Rh positive

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

Fischer
Landsteiner
Bernstein
Wiener

If the childs blood group is ‘O’ and fathers blood group is ‘A’ and mother’s blood group is ‘B’ the genotype of the parents will be

I^A I^A and I^B I^o
I^A I^o and I^B I^o
I^A I^o and I^oI^o
I^oI^o and I^B I^B

Pataus’ syndrome is also referred to as

13-Trisomy
18-Trisormy
21-Trisormy
None of these

Three children of a family have blood groups A, AB and B. What could be the genotypes of their parents?

I^A I^B and ii
I^A I^o and I^BI^o
I^B I^B and I^A I^A
I^A I^A and ii

Part - B

Generic 2 - Answer All Question

What are Gynandromorphy?

What are holandric genes?
What is Lyonisation?

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

Mention two measures under negative eugenics

How does hemophilia affect an individual?

Part - C

Generic 3 - Answer All Question

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

What is SRY?

What are Y linked or holandric genes?

Explain the genetic basis of ABO blood grouping man.

Females are carriers of Haemophilia. Give Reason.
Explain male heterogamety

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?
Discuss the genic balance mechanism of sex determination with reference to Drosophila.

Brief about female heterogamety

Explain criss-cross pattern of inheritance with an example. (or) Explain Inheritance of colour blindness.

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