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Chapters
2: Human Reproduction
3: Reproductive Health
▶ 4: Principles of Inheritance and Variation
5: Molecular Genetics
6: Evolution
7: Human Health and Diseases
8: Microbes in Human Welfare
9: Applications of Biotechnology
10: Organisms and Populations
11: Biodiversity and its Conservation
12: Environmental Issues
![Samacheer Kalvi solutions for Biology (Zoology) [English] Class 12 TN Board chapter 4 - Principles of Inheritance and Variation - Shaalaa.com](/images/biology-zoology-english-class-12-tn-board_6:5f2b1b2038084cf381bfa42c826a928c.jpg "Samacheer Kalvi solutions for Biology (Zoology) [English] Class 12 TN Board chapter 4 - Principles of Inheritance and Variation")
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Solutions for Chapter 4: Principles of Inheritance and Variation
Below listed, you can find solutions for Chapter 4 of Tamil Nadu Board of Secondary Education Samacheer Kalvi for Biology (Zoology) [English] Class 12 TN Board.
Samacheer Kalvi solutions for Biology (Zoology) [English] Class 12 TN Board 4 Principles of Inheritance and Variation Evaluation [Pages 55 - 56]
Haemophilia is more common in males because it is a ____________.
Recessive character carried by Y-chromosome
Dominant character carried by Y-chromosome
Dominant trait carried by X-chromosome
Recessive trait carried by X- chromosome
ABO blood group in man is controlled by ____________.
Multiple alleles
Lethal genes
Sex linked genes
Y-linked genes
Three children of a family have blood groups A, AB and B. What could be the genotypes of their parents?
IA IB and Io Io
IA Io and IB Io
IB IB and IA IA
IA IA and Io Io
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 phenotypes in the progeny are possible from the parental combination AxB?
A and B only
A, B and AB only
AB only
A, B, AB and O
Which of the following phenotypes is not possible in the progeny of the parental genotypic combination IA IO x IA IB?
AB
O
A
B
Which of the following is true about the 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
What can be the blood group of offspring when both parents have AB blood group?
AB only
A, B and AB
A, B, AB and O
A and B only
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 ____________.
IA IA and IB Io
IA Io and IB Io
IA Io and Io Io
Io Io and IB IB
XO type of sex determination and XY type of sex determination are examples of ____________.
Male heterogamety
Female heterogamety
Male homogamety
Both Female heterogamety and Male homogamety
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
Father of a child is colourblind and mother is carrier for colourblindness, the probability of the child being colourblind is ____________.
25%
50%
100%
75%
A marriage between a colourblind man and a normal woman produces ____________.
All carrier daughters and normal sons
50% carrier daughters and 50% normal daughters
50% colourblind sons and 50% normal sons
All carrier offsprings
Mangolism is a genetic disorder which is caused by the presence of an extra chromosome number ____________.
20
21
4
23
Klinefelters’ syndrome is characterized by a karyotype of ____________.
XYY
XO
XXX
XXY
Females with Turners’ syndrome have
Small uterus
Rudimentary ovaries
Underdeveloped breasts
All of these
Pataus’ syndrome is also referred to as ____________.
13-Trisomy
18-Trisomy
21-Trisomy
None of these
“Universal Donor” and “Universal Recipients” blood group are ______ and _______ respectively.
AB, O
O, AB
A, B
B, A
ZW-ZZ system of sex determination occurs in
Fishes
Reptiles
Birds
All of these
Co-dominant blood group is ____________.
A
AB
B
O
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
What is haplodiploidy?
Distinguish between heterogametic and homogametic sex determination systems.
What is Lyonisation?
What is criss-cross inheritance?
Why are sex linked recessive characters more common in the male human beings?
What are holandric genes?
Mention the symptoms of Phenylketonuria.
Mention the symptoms of Down's syndrome.
Explain the genetic basis of ABO blood grouping in man.
How is sex determined in human beings?
What is male heterogamety?
Brief about female heterogamety.
Give an account of the genetic control of the Rh factor.
Explain the mode of sex determination in honeybees.
What are the applications of Karyotyping?
Explain the inheritance of sex-linked characters in human being.
Solutions for 4: Principles of Inheritance and Variation
Samacheer Kalvi solutions for Biology (Zoology) [English] Class 12 TN Board chapter 4 - Principles of Inheritance and Variation
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Concepts covered in Biology (Zoology) [English] Class 12 TN Board chapter 4 Principles of Inheritance and Variation are Multiple Alleles, Human Blood Groups, Genetic Control of Rh Factor, Sex Determination, Sex Linked Inheritance, Karyotyping, Genetic Disorders, Chromosomal Abnormalities, Pedigree Analysis.
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