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Principles of inheritance and variation : NEET MCQ Questions

Are you looking for NEET MCQ Questions on Principles of inheritance and variation? If Yes then you are at right place. Here you will find Principles of inheritance and variation NEET MCQ Questions and Answers, Trivia, Quiz, Interview MCQ & Principles of inheritance and variation Current Affairs for Competitive Exams like Neet exams, around 30% to 40% of Neet questions are asked from given Principles of inheritance and variation Mcqs. as you know Questions and Ansers on Principles of inheritance and variation MCQS is very important for Neet Exam. In this Principles of inheritance and variation NEET section for Neet competition we are covering NEET MCQ Questions on Principles of inheritance and variation

Contents

Question 1 : Genetic balance theory for sex determination in Drosophila was proposed by

A. Prof. R. P. Roy

B. H. E. Warmed

C. C.B. Bridges

D. Mc. Chang

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Question 2 : What does the term recombination describe?

A. Generation of non-parental gene combination

B. Generation of parental gene combination

C. Generation of internal gene combination

D. All of the above

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Question 3 : When is there no possibility of an independent assortment of genes during gametogenesis then What Will be the real ratio of F2 in dihybrid cross?

A. 9 : 3 : 3 : 1

B. 11 : 1 : 1 : 3

C. 12 : 1 : 1 : 2

D. 9 : 3 : 2 : 2

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Question 4 : This is a reversal of mutation

A. Spontaneous mutation

B. Zygotic mutation

C. Back mutation

D. Recessive mutation

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Question 5 : In this group of plants, the male is heterogametic and the female is homogametic type

A. Gymnosperms

B. Bryophytes

C. pteridophytes

D. angiosperms

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Question 6 : In human being sex chromosomal complement is

A. XX – XY

B. XX – XO

C. ZO – ZZ

D. ZW – ZZ

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Question 7 : In humans, height shows a lot of variation. It is an example of

A. Multiple alleles

B. Pleiotropic inheritance

C. polygenic inheritance

D. False allelic inheritance

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Question 8 : The longer the chromosome of an organism, the more genetic variability it gets from

A. Independent assortment

B. Linkage

C. Crossing over

D. Mutation

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Question 9 : Segregation of genes takes place during which phase of cell division?

A. Metaphase

B. Anaphase

C. prophase

D. Embryo formation

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Question 10 : Crossing over during meiosis occurs between

A. sister chromatids

B. Non-sister chromatids

C. Centromeres

D. Non-homologous chromosomes

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Question 11 : A cross between hybrid and a parent is known as

A. Test cross

B. Back cross

C. Monohybrid cross

D. Reciprocal cross

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Question 12 : In a multiple allele system, a gamete possesses

A. 2 alleles

B. 3 alleles

C. one allele

D. several alleles

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Question 13 : In Bonellia all larva are genetically and cytologically similar. In this worm, male individuals live in the uterus of females. If a particular larva settles near the proboscis of an adult female, it becomes a male individual. The larva develops free in water it becomes

A. Male individuals

B. Female individuals

C. Inter Sex

D. Super female

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Question 14 : Punnet square is used to know

A. the outcome of a cross

B. the probable result of a cross

C. Types of gametes

D. Number of gametes

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Question 15 : In T. H. Morgan’s Experiment on Drosophilia, what will be the result when F1 female flies are crossed with double recessive male flies?

A. 83% parental combinations 17% Recombinations

B. 41.5 % parental combinations 58.5% recombinations

C. 60% parental combinations 40 % recombinations

D. 90 % parental combinations 10% Recombinations

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Question 16 : What is called Free martin?

A. Sterile male born along with a fertile female

B. Sterile intersex born along with a fertile female

C. Sterile super male born along with an intersex

D. Sterile female born along with a fertile male

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Question 17 : Which is a very common method to study Human Karyotypes?

A. Blood culture method

B. Tissue culture method

C. Pedigree method

D. Statistical method

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Question 18 : State the mutant gene Which converts the male flowers into female flowers In Maize plant

A. TA TA

B. ta ta

C. TA Ta

D. Both (a) & (c)

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Question 19 : The recessive genes located on X – chromosomes of humans are always

A. Lethal

B. Sub – Lethal

C. expressed in males

D. expressed in females

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Question 20 : which statement is incorrect regarding gene mutation

A. Mutations may be gradual or they may not be induced.

B. Mutation is an evolutionary agent

C. Any gene can undergo mutation

D. Mutated gene is harmful to the individual

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Question 21 : Zea mays have 10 pairs of chromosomes. Linkage groups present in it are

A. 5

B. 10

C. 20

D. 40

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Question 22 : Which condition among the following is lethal?

A. (2n-2)

B. (2n +2)

C. (2n +1)

D. (2n- 1)

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Question 23 : By which gene sex is determined in Spinach?

A. Single-gene “m” located in the X- chromosome

B. Single-gene “m” located in the Y- chromosome

C. Single-gene “t” located in the X- chromosome

D. Single-gene “t” located in the Y- chromosome

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Question 24 : What is an incorrect statement about Gynandromorphs?

A. Individuals who show male characters and female characters

B. Individuals who show only female characters

C. It happens due to less of X- chromosomes

D. It happens due to binucleated eggs

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Question 25 : What happens to excessive phenylalanine accumulation in the blood of a phenylketonuria patient?

A. Get deposited on synovial membrane

B. excreted in urine

C. Get deposited in storage organs

D. All of the above

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Question 26 : Down’s Syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father?

A. 25%

B. 50%

C. 75%

D. 100%

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Question 27 : What will be expected blood groups in the offspring when there is a cross between AB blood group mother and heterozygous B blood group father?

A. 25 % AB group 25 % A group 50 % B group

B. 50 % AB group 25 % A group 25 % B group

C. 25% AB group 50% O group 25 % A group

D. 25 % O group 50 % B group 25 % A group

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Question 28 : Haemophilia is more commonly seen in human males than in human females because

A. a greater proportion of girls died in infancy

B. this disease is due to a Y- Y-linked recessive mutation

C. this disease is due to an X-linked recessive mutation

D. this disease is due to an X-linked dominant mutation

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Question 29 : Name the disorder caused by the trisomy of sex chromosomes

A. Down’s syndrome

B. Klinefelter’s syndrome

C. Turner’s syndrome

D. Edward’s syndrome

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Question 30 : How many different gametes will be produced by a plant having the genotype AABbCC?

A. Two

B. Three

C. Four

D. Nine

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Question 31 : The genes Controlling the seven characters of a pea plant studied by Mendel are now known to be located on how many different chromosomes?

A. Seven

B. Six

C. Five

D. Four

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Question 32 : Cri – du -chat Syndrome in humans is caused by the

A. trisomy of the 21st chromosome

B. Fertilization of an XX egg by a normal Y – bearing sperm

C. loss of half of the short arm of chromosome 5

D. loss of half of the long arm of chromosome 5

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Question 33 : A male human is heterozygous for autosomal genes A and B and is also hemizygous for haemophilic gene h. What proportion of his sperms will be abh?

A. 1/8

B. 1/32

C. 1/16

D. 1/4

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Question 34 : Large, thick, Swollen tongue and drooping lips are the symptoms of which genetical disorder

A. Autosomal aneuploidy

B. Trisomy of 21st chromosome

C. Down’s syndrome

D. Total number of chromosomes become 47

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Question 35 : Which law of Mendel can be explained on the chromosomal basis of inheritance?

A. Law of dominance

B. Law of segregation

C. Law of independent assortment

D. All the above

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Question 36 : A normal woman, whose father was colour blind is married to a normal man. The sons would be

A. 75% Colour blind

B. 50% colour blind

C. all normal

D. all colourblind

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Question 37 : 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?

A. AaBB

B. AABb

C. AABB

D. AaBb

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Question 38 : Lack of independent assortment of two genes A and B in fruitfly the Drosophilia is due to

A. Repulsion

B. Recombination

C. Linkage

D. Crossing over

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Question 39 : Which one of the following is an example of polygenic inheritance?

A. Skin colour in humans

B. Flower colour in Mirabilis jalapa

C. Production of male honey bee

D. Pod shape in garden pea

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Question 40 : A woman with normal vision, but whose father was colourblind, marries a colourblind man. Suppose that the fourth child of this couple was a boy. This boy

A. Maybe colourblind or may be of normal vision

B. Must be colourblind

C. Must have normal colour vision

D. Will be partially colourblind since he is heterozygous for the colourblind mutant allele.

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Question 41 : Test cross involves

A. Crossing between two genotypes with a dominant trait

B. Crossing between two genotypes with a recessive trait

C. Crossing between two F1 hybrids

D. Crossing the F1 hybrid with a double recessive genotype

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Question 42 : Inheritance of skin colour in humans is an example of

A. Point Mutation

B. Polygenic inheritance

C. Codominance

D. Chromosomal aberrations

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Question 43 : The genotype of a plant showing the dominant phenotype can be determined by

A. test cross

B. dihybrid cross

C. pedigree analysis

D. back cross

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Question 44 : 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 are affected. Which of the following mode of inheritance do you suggest for this disease?

A. Sex-linked dominant

B. Sex-linked recessive

C. Sex – limited recessive

D. Autosomal dominant

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Question 45 : In the hexaploid wheat, the haploid (n) and basic (X) numbers of chromosomes are

A. n = 21 and X = 21

B. n = 21 and X =14

C. n = 21 and X = 7

D. n = 7 and X =21

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Question 46 : 1: 1: 1: 1 ratio shows

A. Monohybrid cross

B. Dihybrid cross

C. Back cross

D. Dihybrid test cross

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Question 47 : what is called pleiotropism?

A. Phenomenon of multiple effects of a simple gene

B. Phenomenon of multiple effects of multiple genes

C. Phenomenon of multiple effects of multiple alleles

D. all of the above

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Question 48 : Genes do not occur in pairs in

A. Zygote

B. Somatic cell

C. Endosperm cell

D. Gametes

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Question 49 : In the Mirabilis plant the appearance of the pink hybrid (Rr) between a cross of a red (RR) and white (rr) flower parent indicates

A. Segregation

B. Dominance

C. Incomplete dominance

D. Heterosis

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Question 50 : Name the Plant possessing two X chromosomes

A. Humulus japanic

B. Dioscoria sinulate

C. Flagellaria

D. Both (a) & (b)

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