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

(1) The discrete unit controlling a particular character is called a factor

(2) Out of one pair of factors one is dominant, and the other is recessive

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

(4) Factors occur in pairs

Subtopic:  Law of Segregation |
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From NCERT
NEET - 2010
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The genotype of a plant showing the dominant phenotype can be determined by

(1) test cross

(2) dihybrid cross

(3) pedigree analysis

(4) back cross

Subtopic:  Monohybrid Cross: Further Understanding |
 84%
From NCERT
NEET - 2010
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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?

(1) Three

(2) One

(3) Four

(4) Two

Subtopic:  Dominance Deviation from Mendel: 2 |
 82%
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NEET - 2010
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Select the correct statement from the ones given below with respect to dihybrid cross.

(1) Tightly linked genes on the same chromosome show higher recombinations

(2) Genes far apart on the same chromosome show very few recombinations

(3) Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones

(4) Tightly linked genes on the same chromosome show very few recombinations.

Subtopic:  Linkage |
 79%
From NCERT
NEET - 2010
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Sickel cell anaemia is

(1) an autosomal linked dominant trait 

(2) caused by substitution of valine by glutamic acid in the β-globin chain of haemoglobin.

(3) caused by a change in base pair of DNA

(4) characterized by elongated sickle like RBCs with a nucleus. 

Subtopic:  Mendelian Disorders: Sickle Cell Anemia |
From NCERT
NEET - 2009
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Select the incorrect statement from the following

(1) linkage is an exception to the principle of independent assortment in heredity

(2) galactosemia is an inborn error of metabolism

(3) small population size results in random genetic drift in a population

(4) baldness is a sex limited trait

Subtopic:  Conclusion |
 55%
NEET - 2009
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Which one of the following condition in human is correctly matched with its chromosomal abnormality/linkage?

(1) Klinefelter's syndrome—44 autosomes + XXY

(2) Colourblindness —Y-linked

(3) Erythroblastosis foetalis— X-linked

(4) Down syndrome—44 autosomes + XO

 

Subtopic:  Non - Disjunction & Aneuploidy |
 78%
From NCERT
NEET - 2008
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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 ?

(1) AaBb

(2) AaBB

(3) AABb

(4) AABB

Subtopic:  Dihybrid Cross Analysis |
 85%
NEET - 2007
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Inheritance of skin colour in humans is an example of :

(1) chromosomal aberration

(2) point mutation

(3) polygenic inheritance 

(4) codominance

Subtopic:  Polygenic Inheritance & Pleiotropy |
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NEET - 2007
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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 :

(1) higher number of the recombinant types

(2) segregation in the expected 9 : 3 : 3 : 1 ratio

(3) segregation in 3 : 1

(4) higher number of the parental types

Subtopic:  Dihybrid Cross: Details |
 58%
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NEET - 2007
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