Heredity and Variation Set 4 MCQs

Q1 | .Which of the following is not a hereditary disease? AIPMT - 2004

Cystic Fibrosis

Thalassaemia

Haemophilia

Cretinism

cessive

Q2 | .Haemophilia is more commonly seen in human males than in human females because

a greater proportion of girls die in infancy AIPMT - 2004

this disease is due to a Y- linked recessive mutation

this disease is due to an X - linked recessive mutation

this disease is due to an X- linked dominant mutation

cessive

Q3 | .A woman with 47 chromosomes due to 3 copies of chromosome 21 is characterized by AIPMT - 2005

Super Femaleness

Triploidy

Turner's Syndrome

Down's Syndrome

cessive

Q4 | . A man and a woman, who do not show any apparent signs of a certain inherited disease, have Seven Children (2 daughters and 5 sons). Three of the Sons suffer from the given disease but none of the daughters affected. Which of the following mode of inheritance do you suggest for this disease? AIPMT - 2005

Sex - linked dominant

Sex - linked recessive

Sex - limited recessive

Autosomal dominant

cessive

Q5 | .Which one of the following is an example of polygenic inheritance ? AIPMT - 2006

Skin colour in humans

Flower colour in Miralibilis jalapa

Production of male honey bee

Pod shape in garden pea

cessive

Q6 | .Phenotype of an organism is the result of AIPMT - 2006

genotype and environmental interactions

mutations and linkages

Cytoplasmic effects and nutrition

environmental changes and sexual dimorphism

cessive

Q7 | .How many different gametes will be produced by a plant having the genotype AABbCC? AIPMT - 2006

Two

Three

Four

Nine

cessive

Q8 | .In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkledSeeds (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?

Round Seeds with yellow cotyledons, and wrinkled seeds with yellow cotyle dons

Only round seeds with green cotyledons

Only wrinkled seeds with yellow cotyledons

Only wrinkled seeds with green cotyledons

cessive

Q9 | Test cross involves AIPMT - 2006

Crossing between two genotypes with dominant trait

Crossing between two genotypes with recessive trait

Crossing between two F1 hybrids

Crossing the F1 hybrid with a double recessive genotype

cessive

Q10 | . If a colourblind woman marries a normal visioned man, their sons will be AIPMT - 2006

all colourblind

all normal visioned

one - half colourblind and one - half normal

three - fourths colourblind and one - fourth normal

cessive

Q11 | . In the hexaploid wheat, the haploid (n) and basic (X) numbers of chromosomes are AIPMT - 2007

n = 21 and X = 21

n = 21 and X =14

n = 21 and X = 7

n = 7 and X =21

cessive

Q12 | . Inheritance of skin colour in humans is an example of AIPMT - 2007

Point Mutation

Polygenic inheritance

Codominance

Chromosomal aberrations

cessive

Q13 | . In pea plants, yellow seeds are dominant to green, If a heterozygous yellow seeded plant isCorssed with a green seeded plants, what ratio of yellow and green seeded plants, would you expect in F1 generation? AIPMT - 2007

9:01

1:03

3:01

50:50:00

cessive

Q14 | .A human male produces sperms with the genotypes AB , Ab , aB , ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person? AIPMT - 2007

AaBB

AABb

AABB

AaBb

cessive

Q15 | .Which one of the following conditions in human is correctly matched with its chromosomal abnormality / linkage ? AIPMT - 2008

Erythro blastosis foetalis - X - linked

Down's syndrome - 44 autosomes +XXY

Kline Felter's syndrome - 44 autosomes +XXY

Colour blindness - Y - linked.

cessive

Q16 | .The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because "O" in it refers to having AIPMT - 2009

Overdominance of this type on the genes for A and B types

One antibody only - either anti - A or anti - B on the RBCs

no antigens A and B on RBCs

other antigens besides A and B on RBCs

cessive

Q17 | . Sickle cell anemia is AIPMT - 2009

Caused by substitution of Valine by glutamic acid in the beta globin chain of haemo globin.

Caused by a change in a single base pair of DNA

Characterized by elongated sickle like RBCS with a nucleus

An autosomal dominant trait.

cessive

Q18 | .Which one of the following can not be explained on the basis of Mendel's law of dominance? AIPMT - 2009

The discrete unit controlling a particular character is called a factor

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

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

Factors occur in pairs

cessive

Q19 | . The genotype of a plant showing the dominatnt phenotype can be determined by AIPMT - 2010

test cross

dihybrid cross

pedigree analysis

Back Cross

cessive

Q20 | . Select the correct statement from the ones given below with respect to dihybrid cross.

Tightly linked genes on the same chromosomes show higher recombinations

Genes far apart on the same chromosome show very few recombinations

Genes loosely linked on the same chrososome show similar recombinations

Tightly linked genes on the samechromosome show very few recombinations

cessive

Q21 | .ABO blood groups in humans are controlled by the gene I. It has three alleles - IA , IB and i . Since there are 3 different alleles six different genotypes are possible. How many phenotypesOccur? AIPMT - 2010

Three

One

Four

Two

cessive

Q22 | Which one of the following symbols and its representation used in human pedigree analysis is correct? AIPMT - 2010

#NAME?

cessive

Q23 | Study the pedigree chart of a certain family given below and select the correct conclusion which can be drawn for the character

The female parent is heterozygous

The parent could not have had a normal daughter for this character

The trait under study could not be colourblindness

The male parent is homozygous dominant

cessive

Q24 | Which one of the following conditions correctly describes the manner of determining the sex? AIPMT - 2011

Homozygous sex chromosomes (ZZ) determine female sex in birds

XO type of sex chromosomes determine male sex in grasshopper

XO condition in humans as found in Turner's syndrome, determines female sex

Homozygous sex chromosomes (XX) produce male in Drosophila

cessive

Q25 | Mutations can be induced with AIPMT - 2011

Infra red radiations

IAA

Ethylene

gamma radiations

cessive