Principles of Inheritance and Variation Additional Practice Test

12th Standard Zoology — Principles of Inheritance and Variation: Additional Online Practice Test

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What term is used to describe individuals who secrete ABO blood group antigens in their bodily fluids, such as saliva?

A.Non-secretors B.Secretors C.Null individuals D.Carriers

Why is the IO allele of the ABO blood group system referred to as a null allele?

A.It produces an inactive form of N-acetyl galactose transferase. B.It lacks any chromosomal locus on the homologous chromosomes. C.It does not produce any active terminal transferase enzyme to add sugars to the precursor. D.It encodes a defective galactose transferase that degrades H substances.

According to the text, what is the size of the human Y chromosome and the number of functional genes it carries?

A.165 Mb in size with about 1,000 genes B.60 Mb in size with 60 functional genes C.60 Mb in size with about 1,000 genes D.165 Mb in size with 60 functional genes

Individuals with homomorphic sex chromosomes are characterized by which of the following features?

A.They produce two distinct types of gametes and are heterogametic. B.They possess dissimilar sex chromosomes and are homogametic. C.They produce only one type of gametes and are homogametic. D.They possess dissimilar sex chromosomes and are heterogametic.

Which type of sex determination mechanism is exhibited by domestic chickens?

A.XX-XY type B.ZO-ZZ type C.ZW-ZZ type D.XX-XO type

Which region of the human Y chromosome shares homology with the X chromosome and undergoes synapsis and recombination during meiosis?

A.SRY gene region B.Non-homologous region C.Pseudoautosomal regions (PARs) D.Holandric regions

In which organism and cell type did Barr and Bertram first observe the condensed sex chromatin body?

A.Red blood cells of a female human B.Nerve cells of a female cat C.Epithelial cells of a male Drosophila D.Salivary gland cells of a female mouse

What evolutionary term describes the behavior where sterile diploid worker honeybees raise the queen's eggs to support her reproductive success?

A.Natural selection B.Kin selection C.Sexual selection D.Artificial selection

Cytoplasmic or extrachromosomal inheritance in animals is traditionally studied using which of the following model organisms?

A.Drosophila melanogaster eye color B.Shell coiling in Limnaea and kappa particles in Paramecium C.Sickle cell traits in human lineages D.Red-green color blindness in mammals

Q10

Why is hypertrichosis of the ear pinna in humans transmitted strictly from fathers to their sons?

A.It is an autosomal dominant trait that is suppressed in females. B.It is determined by a holandric gene located on the non-homologous region of the Y chromosome. C.It is an X-linked recessive trait with high penetrance in males. D.It is a mitochondrial trait inherited through maternal cytoplasm.

Q11

Which of the following represents the normal polypeptide chain composition of a human hemoglobin molecule?

A.Four alpha globin chains B.Two alpha and two beta globin chains C.Four beta globin chains D.One alpha and three beta globin chains

Q12

What does the term Euphenics refer to in the context of improving the human race?

A.The elimination of defective germplasm through sterilization and selective immigration. B.The symptomatic treatment of genetic diseases, also known as medical engineering. C.The improvement of the human race by enhancing environmental conditions like nutrition. D.The selection of desirable genotypes by encouraging early marriages.

Q13

Who coined the term Euphenics in 1960 to describe the control of inherited human diseases?

A.Francis Galton B.Gregor Mendel C.Joshua Lederberg D.Karl Pearson

Q14

Which science focuses on the improvement of the human race by providing better nutrition, unpolluted ecological conditions, and education?

A.Eugenics B.Euphenics C.Euthenics D.Genomics

Q15

Who is recognized as the founder of the modern Eugenics movement?

A.Gregor Mendel B.Charles Darwin C.Francis Galton D.Joshua Lederberg

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About this Principles of Inheritance and Variation test

This free online practice test covers Principles of Inheritance and Variation from the 12th Standard Zoology (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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