If two persons 'AB' blood group marry and have sufficiently large number of children, these children could be classified as 'A' blood group : 'AB' blood group : 'B' blood group in 1 : 2 : 1 ratio. Modern technique of protein electrophoresis reveals presence of both 'A' and 'B' type proteins in 'AB' blood group individuals. This is an example of

 

  • codominance

  • incomplete dominance

  • partial dominance

  • complete dominance 

Which Mendelian idea is depicted by a cross in which the F1 generation resembles both the parents?

  • Incomplete dominance

  • Law of dominance

  • Inheritance of one gene

  • Codominance

The incorrect statement with regard to haemophilia is

  • it is a sex-linked disease

  • it is a recessive disease

  • it is a dominant disease

  • a single protein involved in the clotting of blood effected

F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1:2:1. It represents a case of 

  • codominance

  • dihybrid cross

  • monohybrid cross with complete dominance

  • monohybird cross the incomplete dominance

Which one of the following conditions correctly describes the manner of determining the sex in the given example?

  • XO type of sex chromosomes determine male sex in grasshopper

  • XO condition in humans as found in Turner syndromee, determines female sex

  • Homozygous sex chromosomes (XX) produce male in  Drosophila

  • Homozygous sex chromosomes (ZZ) determine female sex in birds

Mutations can be induced with 

  • IAA

  • ethylene

  • gama radiations

  • infra red radiations

Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?

  • The discrete unit controlling a particular character is called a factor

  • Out of one pair of factors one is dominant, and the other is recessive

  • Alleles do not show any blendings and both the characters recover as such in F2 generation.

  • Factors occur in pairs

The genotype of a plant showing the dominant phenotype can be determined by

  • test cross

  • dihybrid cross

  • pedigree analysis

  • back cross

ABO blood groups in humans are controlled by the gene I. It has three alleles — IA, IB and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

  • Three

  • One

  • Four

  • Two

Select the correct statement from the ones given below with respect to dihybrid cross.

  • Tightly linked genes on the same chromosome show higher recombinations

  • Genes far apart on the same chromosome show very few recombinations

  • Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones

  • Tightly linked genes on the same chromosome show very few recombinations.

Which one of the following symbols and its representation, used in human pedigree analysis is correct?

  • = Marriage between relatives

  • = Unaffected male

  • = Unaffected female

  • = Male affected

Sickel cell anaemia is

  • an autosomal linked dominant trait 

  • caused by substitution of valine by glutamic acid in the β-globin chain of haemoglobin.

  • caused by a change in base pair of DNA

  • characterized by elongated sickle like RBCs with a nucleus. 

Point mutation involves

  • insertion

  • change in single base pair

  • duplication

  • deletion

Select the incorrect statement from the following

  • linkage is an exception to the principle of independent assortment in heredity

  • galactosemia is an inborn error of metabolism

  • small population size results in random genetic drift in a population

  • baldness is a sex limited trait

Which one of the following condition in human is correctly matched with its chromosomal abnormality/linkage?

 

  • Klinefelter's syndrome—44 autosomes + XXY

  • Colourblindness —Y-linked

  • Erythroblastosis foetalis— X-linked

  • Down syndrome—44 autosomes + XO

A human male produces sperms with the genotypes AB, Ab, aB and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person ?

  • AaBb

  • AaBB

  • AABb

  • AABB

In the hexaploid wheat, the haploid (n) and basic (x) numbers of chromosomes are:

  • n = 7 and x = 21

  • n = 21 and x = 21

  • n = 21 and x = 14

  • n = 21 and x = 7

Inheritance of skin colour in humans is an example of :

  • chromosomal aberration

  • point mutation

  • polygenic inheritance 

  • codominance

Which of the following genotype express gametes? 

  • TtRrAa

  • TtRA

  • ATRr

  • NMLr

Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridised, then F2 segregation will show :

  • higher number of the recombinant types

  • segregation in the expected 9 : 3 : 3 : 1 ratio

  • segregation in 3 : 1

  • higher number of the parental types

A common test to find the genotype or hybrid is by :

  • crossing of one F2 progeny with male parent

  • crossing of one F2 progeny with female parent

  • studying the sexual behaviour of F1 progenies

  • crossing of one F1 progeny with recessive parent

In pea plants, yellow seeds are dominant to green. If heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green plants would you expect in F1 generation ?

  • 50 : 50

  • 9 : 1

  • 1 : 3

  • 3 : 1

Which one of the following is the most suitable, medium for culture of Drosophila melanogaster ?

  • Moist bread

  • Agar agar

  • Ripe banana

  • Cow dung

Phenotype of an organism is the result of :

  • mutations and linkages

  • cytoplasmic effects and nutrition

  • environmental changes and sexual dimorphism

  • genotype and environmental interactions.

In which mode of inheritance do you expect more maternal influence among the offspring ?

  • Autosomal

  • Cytoplasmic

  • Y-linked

  • X-linked

How many different kinds of gametes will be produced by a plant having the genotype AABbCC ?

  • Three

  • Four

  • Nine

  • Two

Which one of the following is an example of polygenic inheritance ?

  • Flower colour in Mirabilis jalapa 

  • Production of male honey bee

  • Pod shape in garden pea

  • Skin colour in humans

In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), Yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy ?

  • Only round seeds with green cotyledons

  • Only wrinkled with yellow cotyledons

  • Only wrinkled seeds with green cotyledons

  • Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons.

Test cross involves :

  • crossing between two geneotypes with recessive trait

  • crossing between two F1 hybrids

  • crossing the F1 hybrid with a double recessive genotype

  • crossing between two genotypes with dominant trait

Cri-du-chat syndrome in humans is caused by the :

  • fertilization of an XX egg by a normal Y-bearing sperm

  • loss of half of the short arm of chromosome 5

  • loss of half of the long arm of chromosome 5

  • trisomy of 21st chromosome.

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