important questions for NEET-UG 2013

Biology.

 The Mendelian principles of inheritance were rediscovered by

(A)

Sutton and Boveri

(B)

Hugo de Vries, Tschermark and Correns

(C)

Lederberg and Tatum

(D)

Morgan

  Mendel’s work was rediscovered by three biologists from which of the following countries?

(A)

Holland, France and England

(B)

Holland, England and Austria

(C)

Germany, France and England

(D)

Austria, Holland and Germany

 Mendel selected pea plant because of

(A)

its short life span

(B)

it produced many seeds and large flowers

(C)

many contrasting characters

(D)

all of these

 The botanical name of garden pea is

(A)

Pisum sativum

(B)

Lathyrus odoratus

(C)

Mangifera indica

(D)

Solanum tuberosum

 Which of the following is a dominant character in pea?

(A)

Wrinkled seeds

(B)

Inflated pod

(C)

Terminal flower

(D)

Dwarf plant

 Which of the following character was not considered by Mendel?

(A)

Seed coat colour

(B)

Wrinkled or round leaves

(C)

Tallness or dwarfness

(D)

Position of flower

  An inherited character and its detectable variant is called

(A)

allele

(B)

trait

(C)

gene

(D)

both (A) and (B)

 Which one of the following best describes a gene?

(A)

A triplet of nucleotide bases

(B)

A specific length of DNA responsible for the inheritance and expression of the character

(C)

A specific length of single stranded RNA

(D)

Both (B) and (C)

  Mendel’s “factors” are in fact

(A)

units (B) chromosomes

(C)

genes (D) none of these

  Who coined the term ‘gene’ for ‘factor’?

(A)

Mendel (B) Morgan

(C)

Johannsen (D) Punnett

  Alleles or allelomorphs occupy

(A)

same position on homologous chromosomes

(B)

same position on heterozygous chromosomes

(C)

different position on homologous chromosomes

(D)

different position on heterozygous chromosomes

  Who proposed the term 'Allelomorph'?

(A)

Hugo De Vries (B) Morgan

(C)

Tschermak (D) Bateson

  Dominant allele means

(A)

an allele whose effect is masked by another allele

(B)

an allele that prevents the expression of the other allele

(C)

an allele without any effect

(D)

an allele which cannot express in presence of other

  The external appearance of an individual for any trait is called as

(A)

phenotype (B) karyotype

(C)

morphology (D) physique

32. Genotype is

(A)

genetic constitution of an organism

(B)

genetic constitution of somatic cells

(C)

genetic constitution of plastids

(D)

genetic constitution of germ cells

33. Homozygous individuals

(A)

breeds true to the trait

(B)

does not breed true to the trait

(C)

produce only one type of gamete

(D)

both (A) and (C)

34. Which of the following term indicates a pair of dissimilar alleles?

(A)

Homozygous (B) Heterozygous

(C)

Homologous (D) All of these

35. A cross between two pure individuals, differing in atleast one set of characters, is called

(A)

monohybrid (B) polyploid

(C)

mutant (D) variant