-
question_answer1)
Free Martin condition is found in
A)
Man done
clear
B)
Sheep, goat etc. done
clear
C)
Rabbit done
clear
D)
Frog done
clear
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question_answer2)
A female with XXXX chromosome will have the following number of Barr bodies
A)
One done
clear
B)
Two done
clear
C)
Three done
clear
D)
Four done
clear
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question_answer3)
Barr bodies (seen in saliva test in Olympic games) are found in human and are associated with [BHU 1970, 99, 2002; CBSE PMT 1992; MP PMT 1997, 98; KCET 1998]
A)
Male autosome done
clear
B)
Female autosome done
clear
C)
Female sex chromosome done
clear
D)
Male sex chromosome done
clear
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question_answer4)
The chromosomes responsible for the determination of sex are called [CPMT 1992]
A)
Autosomes done
clear
B)
Allosomes done
clear
C)
Multiple alleles done
clear
D)
Heterosis done
clear
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question_answer5)
How many linkage groups are present in Drosophilla
A)
6 done
clear
B)
4 done
clear
C)
2 done
clear
D)
8 done
clear
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question_answer6)
Who put forward the "Theory of linkage''
A)
Sutton done
clear
B)
Morgan done
clear
C)
De Vries done
clear
D)
Bateson and Punnet done
clear
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question_answer7)
The barr body is observed in [Kerala CET 2005]
A)
Basophils of males done
clear
B)
Neutrophils of females done
clear
C)
Eosinophils done
clear
D)
Neutrophils of males done
clear
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question_answer8)
Mule is an offspring of [NCERT 1980]
A)
Male and female donkey done
clear
B)
Cow and ox done
clear
C)
Male ass and mare done
clear
D)
Male horse and female ass done
clear
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question_answer9)
The genotype of a boy having sexual characters of a girl is [DPMT 1985]
A)
XXX done
clear
B)
XXY done
clear
C)
XO done
clear
D)
XYY done
clear
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question_answer10)
The average ratio of male to female individuals based on XX and XY type of sex determination, in total world of human population is [CPMT 1979, 81]
A)
3 : 1 done
clear
B)
1 : 3 done
clear
C)
1 : 4 done
clear
D)
1 : 1 done
clear
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question_answer11)
The sex determination pattern in honeybee is called [MP PMT 1993; AIIMS 1993; MP PMT 2005]
A)
Female haploidy done
clear
B)
Haplodiploidy done
clear
C)
Gametic diploidy done
clear
D)
Gametogony done
clear
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question_answer12)
Sex of a human child is determined by [CPMT 1980; MP PMT 1993, 01, 03]
A)
Size of the egg at the time of fertilization done
clear
B)
Size of the sperm at the time of fertilization done
clear
C)
Sex chromosome of father done
clear
D)
Sex chromosome of mother done
clear
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question_answer13)
Lyon hypothesis deals with [DPMT 1993]
A)
Centromere position done
clear
B)
Genetic compatibility done
clear
C)
Genetic incompatibility done
clear
D)
Number of Barr bodies done
clear
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question_answer14)
Meta-females have [DPMT 1993]
A)
XX done
clear
B)
XO done
clear
C)
XXXX done
clear
D)
XXXXXX done
clear
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question_answer15)
Animal which remains male initially, then changes to female (Tapeworm proglottides) is called [CBSE PMT 1993]
A)
Protandrous done
clear
B)
Apomixis done
clear
C)
Profixation done
clear
D)
None of these done
clear
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question_answer16)
Barr bodies and drumsticks are of what significance to genetists and biologists [AFMC 1993]
A)
They indicate the presence of abnormal sex cells done
clear
B)
They indicate the presence of more than one X chromosome in the cells done
clear
C)
They indicate male calls done
clear
D)
They signify the presence of sex linked traits done
clear
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question_answer17)
Determination of sex of a child depends upon [CPMT 1980]
A)
Nature of sperm done
clear
B)
Nature of egg done
clear
C)
Health of father done
clear
D)
Age of mother done
clear
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question_answer18)
For determination of sex, body cells are taken from
A)
Buccal epithelium done
clear
B)
Buccal epithelium and root of hair done
clear
C)
Gonads done
clear
D)
Root of hairs done
clear
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question_answer19)
Chromosomal abnormality of an unborn baby (while in mother's womb) can be found out by a technique [NCERT 1983; MP PMT 1990, 95]
A)
Amniocentesis done
clear
B)
CAT scanning done
clear
C)
Ultrasound done
clear
D)
Tissue culture done
clear
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question_answer20)
In human beings, sex is determined [MP PMT 1990]
A)
Before fertilization of ovum done
clear
B)
During 6th week of foetal life when androgens are produced done
clear
C)
At the time of fertilization of ovum done
clear
D)
During 7th and 8th weeks of foetal life when gonads differentiate into testis and ovary done
clear
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question_answer21)
Foetal sex can be determined by examining cells from amniotic fluid looking for [BHU 1985; CBSE PMT 1991]
A)
Barr bodies done
clear
B)
Chiasmata done
clear
C)
Sex chromosomes done
clear
D)
Kinetochores done
clear
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question_answer22)
The sex in Drosophila melanogaster is determined by [MP PMT 1994]
A)
X chromosomes done
clear
B)
X and Y chromosomes done
clear
C)
Autosomes done
clear
D)
X chromosomes and autosomes done
clear
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question_answer23)
Male child will be born if [CPMT 1995]
A)
Father is sexually more excited done
clear
B)
Sperm of male with Y chromosome fertilizes the egg done
clear
C)
Sperm of male with X chromosome fertilizes the egg done
clear
D)
None of the above done
clear
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question_answer24)
Barr body in mammals represents [CBSE PMT 1995]
A)
All the heterochromatin in female cells done
clear
B)
One of the two X chromosomes in somatic cells of females done
clear
C)
All the heterochromatin in male and female cells done
clear
D)
The Y chromosome in somatic cells of male done
clear
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question_answer25)
In the buccal cavity slide cell of an individual we get a dark stained body near nuclear membrane. The genotype of the individual may be [DPMT 1983]
A)
XX done
clear
B)
XY done
clear
C)
XYY done
clear
D)
XXX done
clear
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question_answer26)
Drosophila flies with one half of the body male and other half female is referred to as [CBSE PMT 1994]
A)
Gynandromorph done
clear
B)
Hermaphrodite done
clear
C)
Super female done
clear
D)
Intersex done
clear
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question_answer27)
In human female, barr bodies are formed by [CBSE PMT 1996]
A)
Inactivation of mother's X chromosome done
clear
B)
Inactivation of father's X chromosome done
clear
C)
Inactivation of both mother's and fathers X chromosomes done
clear
D)
Inactivation of either mother's or father's X chromosome done
clear
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question_answer28)
Gynandromorphs develop in Drosophila when the two cells in the two-celled proembryo will have one of the following chromosomal sets [MP PMT 1997]
A)
2A + XX in one cell and 2A + X in the other done
clear
B)
2A + X in both the cells done
clear
C)
2A + XXX in both the cells done
clear
D)
All of the above done
clear
View Solution play_arrow
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question_answer29)
Genic balance theory of sex determination was proposed by [MP PMT 1997, 99, 2000; KCET 2004]
A)
Morgan done
clear
B)
Bridges done
clear
C)
Boveri done
clear
D)
Wilkins done
clear
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question_answer30)
There are five daughters and no son in a family. It may be due to [CPMT 1984]
A)
Father produced only X containing sperms done
clear
B)
Father produced no sperms at all done
clear
C)
Y type sperms are weaker and not effective done
clear
D)
By chance each time X sperm fertilized the egg done
clear
View Solution play_arrow
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question_answer31)
Loss of a X chromosome in a particular cell during its development, results into [CBSE PMT 1998]
A)
Diploid individual done
clear
B)
Triploid individual done
clear
C)
Gynandromorphs done
clear
D)
(a) and (b) both done
clear
View Solution play_arrow
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question_answer32)
Genetic identity of a human male is determined by [CBSE PMT 1997; Pb. PMT 1999; KCET 2000; CPMT 2000]
A)
Autosome done
clear
B)
Nucleolus done
clear
C)
Sex chromosome done
clear
D)
Cell organelles done
clear
View Solution play_arrow
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question_answer33)
The theory where ratio between the number of X-chromosomes and number of complete sets of autosomes will determine the sex is known as [MP PMT 2002]
A)
Chromosome theory of sex determination done
clear
B)
Genic balance theory of sex determination done
clear
C)
Hormonal balance theory of sex determination done
clear
D)
Environmental sex determination theory done
clear
View Solution play_arrow
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question_answer34)
If somatic cells of a human male contain single barrbody, the genetic composition of the person would be [JIPMER 1993; MP PMT 2001]
A)
XYY done
clear
B)
XXY done
clear
C)
XO done
clear
D)
XXXY done
clear
View Solution play_arrow
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question_answer35)
Chromosome theory of sex determination was propounded by [MP PMT 2002; BVP 2002]
A)
Bridges done
clear
B)
Balbiani done
clear
C)
Goldschmidt done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer36)
The sex chromosomes in females are [MP PMT 2002]
A)
XX done
clear
B)
XY done
clear
C)
YY done
clear
D)
XXY done
clear
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question_answer37)
Random genetic drift in a population probably results from [CBSE PMT 2002; 03]
A)
Large population size done
clear
B)
Highly genetically variable individuals done
clear
C)
Interbreeding within small isolated population done
clear
D)
Constant low mutation rate done
clear
View Solution play_arrow
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question_answer38)
In melandrium the sex determination type is [Kerala CET 2003]
A)
XX-XY type done
clear
B)
XX-XO type done
clear
C)
ZZ-ZW type done
clear
D)
XY-XO type done
clear
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question_answer39)
A medical technician while observing a human blood smear under the microscope notes the presence of barrbody close to the nuclear membrane in the WBC. This indicates that person under investigation is [Kerala CET 2003]
A)
Colour blind done
clear
B)
Haemophilic done
clear
C)
Normal female done
clear
D)
Normal male done
clear
View Solution play_arrow
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question_answer40)
Sex determination in Drosophila melanogaster is based on [MP PMT 1995; AIEEE 2004]
A)
X-Y chromosome mechanism done
clear
B)
Genetic balance between the X-chromosome and autosomes done
clear
C)
Chromosome - environment interaction done
clear
D)
Pseudoalleles. done
clear
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question_answer41)
Based on Lyon's hypothesis, what will be the number of Barr bodies found in a human female suffering from Down's syndrome [AIEEE 2004]
A)
0 done
clear
B)
1 done
clear
C)
2 done
clear
D)
3 done
clear
View Solution play_arrow
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question_answer42)
Chromosomes that determine male sex in Melandrium plant is [DPMT 2004]
A)
Y chromosome done
clear
B)
X chromosome done
clear
C)
XX chromosome done
clear
D)
None of these done
clear
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question_answer43)
Barr bodies are [CBSE PMT 1993]
A)
Chromatin negative done
clear
B)
Not influenced by stains done
clear
C)
Chromatin positive done
clear
D)
Poorly staining done
clear
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question_answer44)
A family has five girls and no son. Probability of son as the 6th child will be [AFMC 1983, 84, 2000; CPMT 2005]
A)
50% done
clear
B)
75% done
clear
C)
Full done
clear
D)
No chance done
clear
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question_answer45)
The first plant in which chromosomal basis of sex determination was discovered is [BHU 1985, 88]
A)
Melandrium (Lychnis) done
clear
B)
Rumex done
clear
C)
Sphaerocarpus done
clear
D)
Coccinia done
clear
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question_answer46)
In Drosophila, the sex is determined by [CBSE PMT 2003]
A)
Whether the egg is fertilized or develops parthenogenetically done
clear
B)
The ratio of number of X-chromosomes to the sets of autosomes done
clear
C)
X and Y chromosomes done
clear
D)
The ratio of pairs of X-chromosomes to the pairs of autosomes done
clear
View Solution play_arrow