One of the Mendel's pure strains of pea plants had green peas. How many different types of eggs could such a plant produce with regard to pea color?

  • 1

  • 2

  • 4

  • 8

A woman receives her X chromosomes from:

 

  • Her mother only

  • Her father only

  • Both her mother and father 

  • Mitochondria of mother only

Which of the following would not be a feature seen in a patient with the following karyotype ?

  • Many loops on finger tips

  • Congenital heart disease

  • Big and wrinkled tongue

  • Mucus clogging of airways

The disease inheritance pattern exemplified in the given pedigree analysis can be :

  • Hemophilia

  • Red green colour blindness

  • Phenyl ketonuria

  • Polydactyly

Consider the following statements:

I. People affected by phenylketonuria are unable to convert tyrosine to phenylalanine.

II. Alzheimer's disease results from accumulation of amyloid protein plaques in the brain.

III. Klinefelter's and Turner's syndromes are the result of non disjunction of the sex chromosomes in either of sexes.

Which of the above statements are true?

  • I and II only

  • I and III only

  • II and III only

  • I, II and III

Consider the following statements:

I. If we put them through test cross, all homozygous dominant combinations will breed true but heterozygous genotypes will follow the segregation.

II. Two gene interactions such as epistasis do not follow the Menedelian principle of segregation.

III. In any diploid individual, only two alleles can be found, so multiple alleles can be detected only in a population.

Which of the above statements are true?

  • I and II only

  • I and III only

  • II and III only

  • I, II and III

A gene showing codominance has

  • one allele dominant on the other

  • alleles tightly linked on the same chromosome

  • alleles that are recessive to each other

  • both alleles independently expressed in the heterozygote

In his classic experiments on pea plants, Mendel did not use

  • seed colour

  • pod length

  • seed shape

  • flower position

How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?

  • Five

  • Six

  • Eight

  • Seven

Which one from those given below is the period of Mendel's hybridisation experiments?

  • 1856 - 1863

  • 1840 - 1850

  • 1857 - 1869

  • 1870 - 1877

Among the following characters, which one was not considered by Mendel in his experiments on pea?

  • Stem - Tall or Dwarf

  • Trichomes - Glandular or Non-glandular

  • Seed - Green or Yellow

  • Pod - Inflated or Constricted

Thalassemia and sickle-cell anaemia are caused due to a problem in globin molecule synthesis. Select the correct statement.

  • Both are due to a qualitative defect in globin chain synthesis

  • Both are due to a quantitative defect globin chain synthesis

  • Thalassemia is due to less synthesis of globin molecules

  • Sickle-cells anaemia is due to a quantitative problem of globin molecules

A disease caused by an autosomal primary non-disjunction is 

  • Down's syndrone

  • Kilnerfelter's syndrome

  • Turner's syndrome

  • Sickle-cell anemia

The mechanism that causes a gene to move from one linkage group to another is called 

  • inversion

  • duplication

  • translocation

  • crossing-over

A true breeding plant is

  • one that is able to breed on its own

  • produced due to cross-pollination among unrelated plants

  • near homozugous and produces offspring of its own kind

  • always homozygous recessive in its genetic constitution

If a colourblind man marries a woman who is homozygous for normal colour vision, the probalility of their son being colourblind is 

  • 0

  • 0.5

  • 0.75

  • 1

A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio of 

  • 1 : 2 : 1 :: Tall heterozygous : tall homozygous : Dwarf

  • 3 : 1 :: Tall : Dwarf

  • 3 : 1 :: Dwarf : Tall

  • 1 : 2 : 1 :: Tall homozygous : Tall heterogygous : Dwarf

Pick out the correct statements.

I. Haemophilia is a sex-linked recessive disease

II. Down's syndrome is due to aneuploidy.

III. Phenylketonuria is an autosomal recessive gene disorder

IV. Sickle cell anaemia is an x - linked recessive gene disorder

  • II and IV are correct

  • I, III and IV are correct

  • I, II and III are correct

  • I and IV are correct

In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant type offspring. This indicates

  • chromosomes failed to separate during meiosis 

  • the two genes are linked and present on the same chromosome

  • both of the characters are controlled by more than one gene

  • the two genes are located on two different chromosomes

Match the terms in Column I with their description in Column II and choose the correct option.

Column I

Column II

A. Dominance

1. Many genes govern a single character

B. Codominance

2. Ina heterozygous organism only one allele expresses itself

C. Pleiotropy

3. In a heterozygous organism both alleles express themselves fully

D. Polygenic inheritance

4. A single gene influences many characters

Codes : 

 

A

B

C

D

(1)  

2   

3   

4   

1

(2)

4

1

2

3

(3)

4

3

1

2

(4)

2

1

4

3
  • 1
  • 2
  • 3
  • 4

Which of the following most appropriately describes haemophilia?

  • X-linked recessive gene disorder

  • Choromosomal disorder

  • dominant gene disorder

  • Recessive gene disorder

The term "linkage" was coined by :-

  • TH Morgan

  • T Boveri

  • G Mendel

  • W Sulton

In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree

  • Autosomal dominant

  • X-linked recessive

  • Autosomal recessive

  • X-linked dominant

A pleiotropic gene

  •    is expressed only in primitive plants

  •    is a gene involved during Pliocene

  •   controls a trait only in combination with another gene

  •    control multiple traits in an individual

Multiple alleles are present 

  • on different chromosomes

  • at different loci on the same chromosome

  • at the same locus of the chromosome

  • on non-sister chromatids

An abnormal human baby with 'XXX' sex chromosomes was born due to

  • formation of abnormal sperms in the father

  • formation of abnormal ova in the mother

  • fusion of two ova and one sperm

  • fusion of two ova and two sperm

Alleles are

  • different phenotype

  • true breeding homozygotes

  • different molecular forms of a gene

  • heterozygotes

Fruit color in squash is an example of 

  • recessive epistatis

  • dominant epistatis

  • complementary genes

  • inhibitory genes

A human female with turner's syndrome

  • has 45 chromosomes with XO

  • has one additional X-chromosome

  • exhibits male characters

  • is able to produce children with normal husband

Which of the following statements is not true of two genes that show 50% recombination frequency?

 

  • the genes may be on different chromosomes 

  • the genes are tightly linked

  • the genes show independent assortment

  • If the genes are present on the same chromosome, they undergo more than one crossovers in every meiosis

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