Principles of Inheritance and Variation Questions and Answers pdf Download
Principles of Inheritance and Variation is one that enables a problem to be solved using calculus of variations, which concerns finding such functions which optimize the values of quantities that depend upon those functions. These Principles of Inheritance and Variation Questions and Answers pdf are prepared by livemcqs team. These principles of inheritance and variation neet questions cover all NCERT topics. These principles of inheritance and variation question bank pdf are most important for NEET, AIIMS, JIPMER, and various other medical entrance exams.
How many types of gametes are produced by a trihybrid?
A dihybrid heterozygous tall plant with round seed is crossed with a similar genotype, what percentage of plants should posses Tt Rr genotype?
A cross by changing the source of ovum is
Answer: Electrical and chemical
When the phenotypic and genotypic ratios resemble in the F2 generation it is an example of
Answer: Qualitative inheritance
In what situation, the phenotype of a dihybrid cross would exhibit parental combination of characters in more than the expected value and recombination in less than the expected value?
Answer: When genes are in mitochondria
When the dihybrid Tt rr plants are self-fertilized, what percentage of descendants would be heterozygous for one character and homozygous for another?
In a double heterozygous plant, (Eg: Aa Bb) four types of gametes are produced .This illustrate the law of
Answer: Independent assortment
Back cross with recessive parent is called
If a gene has multiple effects, it is called
Maize has 10 pairs of chromosomes. How many linkage groups should it possess
When F1 plants heterozygous for tallness are selfed F2, generation has both tall and dwarf plants. This proves the principle of:
Answer: Law of segregation
Mendel’s formulated the law of purity of gametes on the basis of:
tt mates with Tt. What will be characteristic of offspring:
Failure of segregation of chromatids during cell division Cycle result in the gain or loss of a cromosome (s) is called :
Answer: Female heterogamety
Exception of Mendel’s law is:
Haemophilia is a:
Answer: Mendelian disorder
Down’s syndrome is a:
Answer: Chromosomal disorder
A gamete contains which of the following :
Answer: Only one allele of a gene
Name the scientist who discovered the law of Heredity :
Linked genes may be separated by
Crossing over in diploid organism is responsible for
Answer: Segregation of alleles
Crossing over takes place between
Answer: Non sister chromatids of homologous chromosomes
If the distance between genes on a chromosome is more , the linkage strength is
Drosophila melanogaster has
Answer: 2 pairs of autosomes and 2 pairs of sex chromosomes
A trisomic individual has a chromosomal number of
Among the following which one is the best chemical for inducing the polyploidy?
Down’s syndrome is an example of
Which of the following is 6x (hexaploid) wheat?
The holandric genes are located on
Who put forward the crossing theory of recombination
First child of a normal couple is phenylketouric. The probability of second male child is affected will be
Mutation of any single gene maybe
A normal man whose father was haemophilic marries a women whose father was haemophilic. They have their first child as daughter. What is the chance that this could be
Thallasemia beta is located on
Choose the sex influenced trait
Clotting factors VIII is absent in
Pedigree analysis is useful for
Answer: Study of inheritance when arranged mating is not possible
Choose the incorrect statement regarding haemophilia
Answer: it inherit from father to daughter
First artificial mutation was induced in
Hemophilic person marries a girl having no history of the disease in her pedigree. What is the chance that a haemophilic child is born to them
If a hybrid expresses a character, it is called _________
A plant having the genotype AABbCC will produce ______ kinds of gametes
Colour blindness is an _________ linked recessive trait
In most species, mitochondrial DNA is passed down from
Where are the genes for cytoplasmic male sterility in plants located?
Answer: Mitochondrial genome
_________ is a type of trait whose phenotype is influenced by more than one gene
An individual’s collection of genes is called ______
A man marries a woman and both do not show any apparent traits of inherited disease. Five sons and two daughters are born, and three of their sons suffer from a disease. However, none of the daughters is affected. The following mode of inheritance for the disease is
Answer: Sex-linked recessive
How many type of phenotypes possible for ABO blood group
A person affected with phenylketonuria , lacks an enzyme that converts the amino acid phenylalanine into
Haemophilia in man is due to
Answer: Primary non-disjunction
In XO type of sex determination
Answer: Males produce two different types of gametes
Which one of the following cannot be explained on the basis of Mendel’s Law of Dominance?
Answer: The discrete unit controlling a particular character is called a factor
The genotype of a plant showing the dominant phenotype can be determined by :
Answer: Pedigree analysis
Which one of the following conditions correctly describes the manner of determining the sex in the given example?
Answer: Homozygous sex chromosomes (XX) produce male in Drosophila
F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1:2:1. It represents a case of
Answer: Monohybrid cross with incomplete dominance
Alleles which can express only in pair with similar allele is
Among the following traits that Mendel studied , choose the recessive one
An lndividual with into identical alleles is:
Mendal’s law can be applicable only when:
Answer: Characters are linked
A true hybrid condition is:
The allele which is unable to express its effect in the presence of another is called :
Most of the mutations are:
Smallest segment of genetic material affected by mutation is :
Genes located on V-chroinosome are:
A point mutation is:
Answer: Sickel-cell anaemia
Mendel’s second law is of the law of:
Answer: Independent assortment
When a dominant ‘AA’ and a recessive ‘aa’ are crossed percentage of the progenies showing the parental genotypes will be
A normal visioned man whose father was colour blind ,marries a women whose father is also colour blind . They have their first child as a daughter . What are the chances that this child would be colour blind?
The incorrect statement with regard to Haemophilia is
Answer: A single protein involved in the clotting of blood is affected
Person with blood group AB is considered as universal recipient because he has
Answer: Both A and B antigens on RBC but no antibodies in the plasma
A patient with unknown blood group needs immediate blood transfusion. The group that can be donated will be
Which Mendelian idea is depicted by a cross in which the F1 generation resembles both parents
An F2 hybrid generation will have
Answer: 16 types of genotypes
Who among the following is not concerned with re-discovery of Mendelism
The diploid number of drosophila melanogaster
Linkage phenomenon explained first by
A trait that “overpowers” and hide another trait is called
Why is haemophilia a disease that is more commonly seen in males?
Answer: The disease is X- linked
Sucess of mendal is
Answer: Selection of Peaplant
Loss of Melanin pigment cause for:
Gunetical identification of male human is:
Answer: By Sex-chromosome
Rh+ individual gene may be:
Cause of chromosomal mutation:
Two genes very close on a chromosome will show:
First geneticist/father of genetics was:
Choose the wrong statement
Answer: Sickle cell anemia person produce abnormal Hb
Which of the following cannot be detected in developing foetus by amniocentesis
Which mendelian idea is depicted by a cross in which the F1 generation resembles both the parents?
If both parents are carriers of thalassemia , which is an autosomal recessive disorder , what are the chance of pregnancy resulting in an affected child?
A human female with Turner’s syndrome
Answer: Exhibits male characters
Which of the following cannot be expected on the basis of Mendel’s law of dominance
Answer: It explain expression of both traits in F 2
When heterozygous yellow round seed plants and self-fertilized, the frequency of occurrence of RrYY genotype among the offspring’s is
A person homozygous for autosomal loci ‘a’ and ‘b’ and heterozygous for gene ‘p’ shall produce how many types of gametes in respect of these loci
Experimental proof for chromosome theory of inheritance is given by
The nuclear structure observed by Henking in 50% of the sperms in the testes of a insect was termed
If the haploid number of chromosomes in a plant is 12,then the number of chromosomes in monosomic is
Alleles are paired in
Inheritance of flower colour is an example of incomplete dominance, which is seen in:
Haemophilia most likely originated as a result of
Answer: A gene mutation in the X- chromosome
Chromosome complement with 2n-1 is called as
The most striking example of point mutation is found in a disease called
Answer: Sickle cell anemia
In which of the following, females are heterogametic
Gynaecomastia is a common feature seen in:
Answer: Klinefelter’s syndrome
XO type of sex determination is seen in:
Which of the following is not a Mendelian disorder?
Answer: Turner’s syndrome
Punnett square was developed by:
Who introduced Chromosomal Theory of Inheritance?
The plant Mendel used to study inheritance of two genes is:
Mendel published his work on inheritance of character in?
Female heterogamety is :
Answer: Two different types of gametes are produced by females
Individuals having dissimilar traits (alleles) on homologous chromosomes are called
An allele is considered dominant
Answer: When it express even in the presence of alternate allele
Mendel’s dihybrid ratio is
Mendel studied seven contrasting characters for his breeding experiment with Pisum sativum, which of the following characters did he not use?
An organism with two identical allele of a gene in a cell is called
Which principle of inheritance was not given by Mendel
When dominant BB and recessive bb is crossed, the percentage of progeny showing the parental genotype is
The year 1900AD is highly significant for genetics due to
Answer: Chromosome theory of heredity
The process by which the segregation of Mendelian factors takes place is
Which would most probably be the genetic makeup of the parents of a colour blind daughter?
Answer: Carrier mother and normal father
If a heterozygous tall plant is crossed with a homozygous dwarf plant the proportion of dwarf progeny will be
When two tall plants are crossed 45 tall plants and 14 dwarf plants are obtained.The genotype of parent plants is
Which of the following is not a dominant character selected by Mendel in Pisum?
Variation can occur due to
Who discovered the phenomenon of incomplete dominance in Mirabilis and Antirrhinum?
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