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DR. SAHU’S BOTANY PMT TUITION; BHILAI
Sample Paper of Botany for NEET/AIIMS/CGPMT -2016-2017
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“GENETICS” SEX DETERMINATION AND SEX LINKED INHERITANCE
1. Sex chromosomes of a female bird are represented by---------ZW
2. When released from ovary human egg contain-------- One X chromosome
3. Barr bodies ( seen in saliva test in Olympic games) are found in human and are associated
with--------------------------------- Female sex chromosome.
4. The chromosomes responsible for the determination of sex are called-----------Allosomes
5. Sex chromosomes for the first time was discovered in which plant--------------Sphaerocarpus.
6. In which of the following animals , sex is determined by environment------ Bonellia.
7. The barr body is observed in------------ Neutrophils of females.
8. In Drosophila, the sex is determined by------- The ratio of number of X-chromosomes to the
sets of autosomes.
9. The genotype of a boy having sexual characters of a girl is-------- XXY
10. The first plant in which chromosomal basis of sex determination was discovered is
Coccinia.
11. The sex determination pattern in honeybee is called--------- Haplodiploidy.
12. Sex of a human child is determined by---------- Sex chromosome of father
13. Lyon hypothesis deals with---------- Number of barr bodies .
14. Meta-females have------- XXXX
15. Animal which remains male initially , then changes to female ( tapeworm proglottides) is
called----------------- Protandrous.
16. Barr bodies and drumsticks are of what significance to geneticist and biologists----- they
indicate the presence of more than one X chromosome in the cells.
17. A family has 5 girls and no son. Probability of son as the 6t child will be----- 50%
18. Barr bodies are---------- Chromatin positive.
19. Chromosomal abnormality of an unborn baby can be found out by a technique called----------- Amniocentesis
20. In Human beings, sex is determined ------ At the time of fertilization of ovum.
21. Foetal sex can be determined by examining cells from amniotic fluid looking for------ Barr
bodies.,
22. Chromosomes that determine male sex in Melandrium plant is-------- Y-chromosome.
23. Male child will be born if------- Sperm of male with Y-chromosome fertilized the egg.
24. Barr bodies in mammals represents---------- One of the two X chromosomes in somatic cells
of female
25. Based on Lyon’s hypothesis, what will be the number of Barr bodies found in a human female
suffering from Down’s syndrome-------- 1.
26. Drosophila flies with one half of the body male and other half female is reffered to as---------Gynandromorph
27. In Human female, barr bodies are formed by---------- Inactivation of mother’s X-chromosome
28. Gynandromorphs develop in Drosophila when the two cells in the two celled proembryo will
have one of the following chromosomal sets------------- 2A+ XX in one cell and 2A+ X in the
other.
29. Genic balance theory of sex determination was proposed by-------- Bridges.
30. A medical technician while observing a human blood smear under the microscope notes the
presence of barrbody close to the nuclear membrane in the WBCs. This indicates that person
under investigation is----------- Normal female.
31. Loss of a X-chromosome in a particular cell duringits development, results into-----
Gynandromorphs.
32. Genetic identity of a human male is determined by------------- Sex chromosome
33. The theory where ratio between the number of X-chromosomes and number of complete sets
of autosomes will determined the sex is known as---------- Genic balance theory of sex
determination.
34. If somatic cells of a human male contain single barrbody.,the genetic composition of the
person would be--------------- XXY
35. Chromosome theory of sex determination was propounded by--------- Wilson and Stevence
36. The sex chromosome in females are------------------- XX
37. Random genetic drift in a population probably results from----------- Interbreeding within
small isolated population.
38. In Melandrium the sex determination type is----------- XX—XY type.
39. Which one of the following conditions correctly described the manner of determining the sex
in the given example------------- XO type of sex chromosome determine male sex in
grasshopper.
40. XO type of sex determination is seen in----------- Drosophila.
SEX-LINKED INHERITANCE
1. A colour blind man marries the daughter of a colour blind person.Then in their progeny-------- Half of their sons are colour blind.
2. Given is : X is the chromosome with gene for haemophilia and X is the chromosome with
normal gene. Which of the following individuals will act as carrier for haemophilia---------------------------------------XhX.
3. Colour blindness is found more in males than in females because--------- The male
containing the single affected X chromosome are colour blind.
4. Sex-linked characters are------- Recessive.
5. Which one is a sex-linked disease------------- Colourblindness.
6. If mother is a carrier for colour blindness and father is normal, then in the offsprings this
disease may be seen in------------ 50% sons and 50% daughters ( Carrier)
7. A man can inherit his X-chromosome from--------- His maternal grand mother of maternal
grand father.
8. In a pedigree analysis, = 0 represents----------- Consanguinous mating.
9. If a man who is colour blind marries a woman who is pure normal for colour vision, the
chances of their sons having colourblindness is----------0%
10. A normal visioned man whose father was colourblind, marries a woman whose father was
also colourblind. They have their first child as a daughter. What are the chances that this
child would be colourblind ---------- 0%
11. A man who is suffering from a recessive X-linked disease marries a normal women. Then
what is true about its progeny---------- All sons are normal.
12. Person whose father is colourblind marries a lady whose mother is daughter of a colourblind
man.Their children will be------------------ Some sons are normal and some are coloublind
13. If a coloublind man marries a woman whose father is coloublind.The genotype of their
offsprings are------------- 50% daughters are colourblind.
14. The expression of genes for the production of milk in only females is a-- Sex limited genes.
15. Sex linked characters have one distinct feature------------- Always follows criss-cross
inheritance.
16. Which of the following diseases belongs to the same category as colourblindness in man----------------------Haemophilia
17. X-linked recessive gene is-------------- Always expressed in male.
18. If a colourblind woman marries and a normal visioned man, their sons will be------- all
colourblind
19. A man known to be victim of haemophilia marries a normal woman whose father was known
to be a bleeder,.Then it is expressed that----------- half of their children will be bleeders.
20. Genes of colour blindness are carried in------------ heterosomes.
21. 2% men are red colour blind, 6% are green colour blind.
22. Sex linked disease is---------- Colourblindness and Haemophilia
23. A woman with normal vision, but whose father was colour blind.,marries a colourblind
man.Suppose that the fourth child of this couple was a boy. Thus boy--------- May be colour
blind or may be normal vision.
24. A man and a woman, who do not show any apparent signs of a certain inherited disease,
have seven children (2 daughter 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-------------- Sex-linked recessive.
25. Which of the following is not a herediatary disease---------- Cretinism.
26. If a boy’s father has haemophilia and his mother has one gene for haemophilia; what is the
chance that the boy will inherit the disease------------ 50%
27. Carrier of genes of colourblindness are present in-------------- Mother.
28. Sickle cell anaemia is due to--------------- Genes
29. Sex-linked inheritance was discovered by--------- Morgan.
30. Colour blindness is caused by a single ------------ Recessive gene in man
31. If a haemophilic man marries a woman carrier (heterozygous) for haemophilia, what would be
the possibility that their daughter would be haemophilic ---------- 50%
32. Female rarely experience the physiologic defect of haemophilia because they do so only
when they are----------- Homozygous for defect.
33. A coloublind son will born when------------ Mother is colour blind and father normal.
34. Sex influenced characters are due to ------------ Autosomal genes.
35. A colourblind man has a colourblind sister but a normal brother than phenotype of its
parents is------------------- Father coloublind and mother normal.
36. The frequency of a character is found to be increasing when--------- It is inheritable.
37. The female children of a haemophilic man and a carrier woman are likely to be --------- Half
haemophilic and half carriers
38. The daughter born to haemophilic father and normal mother could be------ Carrier
39. Haemophilia is caused due to lack of -------- AHF
40. A marriage between normal visioned man and colourblind woman will produce which of the
following types of offsprings----------- Coloublind sons and carrier daughters.
41. Sex-linked genes of man are-------------- Present on X-chromosome.
42. If a normal woman marries a colourblind man, their-All children will be normal.
43. A girl of normal vision whose father was colourblind marries a man of normal vision whose
father was also colourblind.Their sons would be ( of total number of sons)-------50%
colourblind.
44. All the sons are haemophilic and daughter are normal of a haemophilic father and normal
mother.This character is-------- Y-linked dominant.
45. In human the inheritance of sex linkage takes place through --------X and Y chromosomes
46. Haemophilia is more commonly seen in human males than females because------------ This
disease is due to an X –linked recessive mutation.
47. Pedigree chart is used to identify------- Genetic diseases.
48. Most studies on human genetics have been made through------- pedigree charts.
49. If a character is always transmitted directly from a father to all sons and from their sons to all
their sons, then which chromosome carries the gene for the character------- Y-chromosome
50. A normal woman whose father was colourblind marries a normal man.What kinds of children
would be expected and in what proportion---------Daughter normal, 50% of sons colourblind
51. A colourblind daughter is born when -------- mother is carrier, father is colourblind.
52. Brachydactyly is due to--------------- Dominant gene on the autosome.
53. Which disease is genetically linked----------- Haemophilia.
54. Haemophilic man marries a normal woman, their offsprings will be-------- All Normal.
55. When an allele fails to explain itself in presence of the other allele, t6he former is asid to be--------------------- Recessive
56. A woman with two genes for haemophillia and one gene for colourblindness on one of the X
chromosomes marries a normal man. How will the progeny be------- 50% haemophilic
colourblind sons and 50% normal sons.
57. A fruit fly is heterozygous for sex linked genes when meted with normal female fruit fly, the
males specific chromosome will enter egg cell in the proportion------- 1 : 1.
58. In which of the following colourblindness is inherited------- In both male and female.
59. Persons who are colour blind cannot distinguish------- red and green.
60. Expected children of a blue-eyed (recessive) woman and brown eyed (dominant) man who
had a blue eyed mother are likely to be----------- One blue eyed and one brown eyed.
61. Gene for colour blind ness is located on------------ non homologous part of X-chromosome.
62. A sex linked recessive gene C produces red green colour blindness in humans. A normal
woman whose father was colourblind marries a colourblind man. Of all girls born to these
parents what percentage is expected to be colourblind-------- 50%
63. A diseased man marries a normal woman.They get three daughters and five sons.All
daughters were diseased and sons were normal. The gene of this disease is--------- Sex
linked dominant.
64. Pattern baldness , moustaches and beard in human males are examples of------- Sex limited
traits.
65. One of the genes present exclusively on the X-chromosome in humans is concerned with---------------------------- Red-green colourblindness.
66. One of the following is not true to haemophilia------------- Y-linked disease.
67. What are the chances of colour blind daughter and sons being born in a marriage of normal
man marrying a normal woman, whose father was colourblind-------- 50% sons are
colourblind and all daughters are phenoptypically normal.
68. A normal woman, whose father was colourblind is married to a normal man. The sons would
be--------------- 50% colourblind.
69. The most common type of haemophilia results from the congenital absence of-----------
Factor—VIII.
70. Which one of the following is a genetically transmitted character-------- Colour blind-ness /
Haemophilia / Hydrocephalous / Muscular dystrophy –all.
71. Which of the following conditions is not X-linked ------ Myopia.
72. More man suffer from colour blind-ness than woman because----------- Men are hemizygous
and one defective gene is enough to make them colourblind .
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