Chapter 5 – Principle Of Inheritance And Variation

All genes located on the same chromosome:

• a.Form different groups depending upon their relative distance
• b.Form one linkage group
• c.Will not from any linkage groups
• d.Form interactive groups that affect the phenotype

Conditions of a karyotype 2n +1, 2n –1 and 2n + 2, 2n – 2 are called:

• a.Aneuploidy
• b.Polyploidy
• c.Allopolyploidy
• d.Monosomy

Distance between the genes and percentage of recombination shows:

• a.a direct relationship
• b.an inverse relationship
• c.a parallel relationship
• d.no relationship

If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is:

• a.Autosomal dominant
• b.Autosomal recessive
• c.Sex-linked dominant
• d.Sex-linked recessive

In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine?

• a.G G G
• b.A A G
• c.G A A
• d.G U G

Person having genotype IA IB would show the blood group as AB. This is because of:

• a.Pleiotropy
• b.Co-dominance
• c.Segregation
• d.Incomplete dominance

Z Z / ZW type of sex determination is seen in:

• a.Platypus
• b.Snails
• c.Cockroach
• d.Peacock

A cross between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents?

• a.TT and Tt
• b.Tt and Tt
• c.TT and TT
• d.Tt and tt

In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that:

• a.The alleles of two genes are interacting with each other
• b.It is a multigenic inheritance
• c.It is a case of multiple allelism
• d.The alleles of two genes are segregating independently.

Which of the following will not result in variations among siblings?

• a.Independent assortment of genes
• b.Crossing over
• c.Linkage
• d.Mutation PURINCIPLE NIT II: NIT II: SSTRUCTURAL OF INHERITANCE TRUCTURAL O AND VARIATION ORGANISATION RGANISATION IN P IN PLANTS ANDA LANTS AND ANIMAL NIMALS 31

Mendel’s Law of independent assortment holds good for genes situated on the:

• a.non-homologous chromosomes
• b.homologous chromosomes
• c.extra nuclear genetic element
• d.same chromosome

Occasionally, a single gene may express more than one effect. The phenomenon is called:

• a.multiple allelism
• b.mosaicism
• c.pleiotropy
• d.polygeny

In a certain taxon of insects some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are:

• a.males and females, respectively
• b.females and males, respectively
• c.all males
• d.all females

The inheritance pattern of a gene over generations among humans is studied by the pedigree analysis. Character studied in the pedigree analysis is equivalent to:

• a.quantitative trait
• b.Mendelian trait
• c.polygenic trait
• d.maternal trait

It is said that Mendel proposed that the factor controlling any character is discrete and independent. His proposition was based on the

• a.results of F3 generation of a cross.
• b.observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending.
• c.self pollination of F1 offsprings
• d.cross pollination of F1 generation with recessive parent

Two genes ‘A’ and ‘B’ are linked. In a dihybrid cross involving these two genes, the F1 heterozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation?

• a.1 : 1 : 1: 1
• b.9:3:3:1
• c.3:1
• d.1:1

In the F2 generation of a Mendelian dihybrid cross the number of phenotypes and genotypes are:

• a.phenotypes - 4; genotypes - 16
• b.phenotypes - 9; genotypes - 4
• c.phenotypes - 4; genotypes - 8
• d.phenotypes - 4; genotypes - 9

Mother and father of a person with ‘O’ blood group have ‘A’ and ‘B’ blood group, respectively. What would be the genotype of both mother and father?

• a.Mother is homozygous for ‘A’ blood group and father is heterozygous for ‘B’
• b.Mother is heterozygous for ‘A’ blood group and father is homozygous for ‘B’
• c.Both mother and father are heterozygous for ‘A’ and ‘B’ blood group, respectively
• d.Both mother and father are homozygous for ‘A’ and ‘B’ blood group, respectively