Sex chromosomes are also known as allosomes. Unlike autosomes, which determine most of an individual's traits, allosomes determine an individual's sex. In humans, males typically have one X and one Y chromosome (XY), while females have two \(\mathrm{X}\) chromosomes (XX). These chromosomes play a crucial role in determining an individual's biological sex and the inheritance of sex-linked traits.
AMU-2005 / Manipal-2004
Principle of Inheritance and Variation
184554
Drosophila flies with XXY genotype are females, but human beings with such genotype are abnormal males. It shows that
1 Y-chromosome is essential for sex determination in Drosophila
2 Y-chromosome is female determination in Drosophila
3 Y-chromosome is male determining in human beings
4 Y-chromosome has no roleinsex determination either in Drosophila or in human beings
Explanation:
In Drosophila, XXY represents a female but in human it is an abnormal male. It shows that \(\mathrm{Y}\) chrosomome is crucial for male sex in human. However, Y-chromosome is essential for female sex determination in Drosophila.
AFMC-2007
Principle of Inheritance and Variation
184555
Number of Barr- bodies in XXXX female
1 one
2 two
3 three
4 four
Explanation:
In a female with a XXXX chromosome configuration, there are typically three Barr bodies. Barr bodies are inactivated \(\mathrm{X}\) chromosomes. In females, one of the \(\mathrm{X}\) chromosomes in each cell is randomly inactivated, forming a Barr body. Since there are four X chromosomes in XXXX females, three of them will be inactivated, resulting in three Barr bodies.
BHU PMT (Screening)-2010
Principle of Inheritance and Variation
184556
Gene TDF occurs in
1 Y-chromosome
2 X-chromosome
3 Both \(\mathrm{X}\) and \(\mathrm{Y}\)-chromosomes
4 autosomes
Explanation:
The gene TDF (Testis-Determining Factor) occurs on the Y-chromosome in humans. It is responsible for initiating the development of male characteristics in individuals who inherit it, typically leading to the development of testis and the male reproductive system.
Sex chromosomes are also known as allosomes. Unlike autosomes, which determine most of an individual's traits, allosomes determine an individual's sex. In humans, males typically have one X and one Y chromosome (XY), while females have two \(\mathrm{X}\) chromosomes (XX). These chromosomes play a crucial role in determining an individual's biological sex and the inheritance of sex-linked traits.
AMU-2005 / Manipal-2004
Principle of Inheritance and Variation
184554
Drosophila flies with XXY genotype are females, but human beings with such genotype are abnormal males. It shows that
1 Y-chromosome is essential for sex determination in Drosophila
2 Y-chromosome is female determination in Drosophila
3 Y-chromosome is male determining in human beings
4 Y-chromosome has no roleinsex determination either in Drosophila or in human beings
Explanation:
In Drosophila, XXY represents a female but in human it is an abnormal male. It shows that \(\mathrm{Y}\) chrosomome is crucial for male sex in human. However, Y-chromosome is essential for female sex determination in Drosophila.
AFMC-2007
Principle of Inheritance and Variation
184555
Number of Barr- bodies in XXXX female
1 one
2 two
3 three
4 four
Explanation:
In a female with a XXXX chromosome configuration, there are typically three Barr bodies. Barr bodies are inactivated \(\mathrm{X}\) chromosomes. In females, one of the \(\mathrm{X}\) chromosomes in each cell is randomly inactivated, forming a Barr body. Since there are four X chromosomes in XXXX females, three of them will be inactivated, resulting in three Barr bodies.
BHU PMT (Screening)-2010
Principle of Inheritance and Variation
184556
Gene TDF occurs in
1 Y-chromosome
2 X-chromosome
3 Both \(\mathrm{X}\) and \(\mathrm{Y}\)-chromosomes
4 autosomes
Explanation:
The gene TDF (Testis-Determining Factor) occurs on the Y-chromosome in humans. It is responsible for initiating the development of male characteristics in individuals who inherit it, typically leading to the development of testis and the male reproductive system.
NEET Test Series from KOTA - 10 Papers In MS WORD
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Principle of Inheritance and Variation
184553
Sex chromosomes are also known as:
1 automomes
2 allosomes
3 genome
4 karyotype
Explanation:
Sex chromosomes are also known as allosomes. Unlike autosomes, which determine most of an individual's traits, allosomes determine an individual's sex. In humans, males typically have one X and one Y chromosome (XY), while females have two \(\mathrm{X}\) chromosomes (XX). These chromosomes play a crucial role in determining an individual's biological sex and the inheritance of sex-linked traits.
AMU-2005 / Manipal-2004
Principle of Inheritance and Variation
184554
Drosophila flies with XXY genotype are females, but human beings with such genotype are abnormal males. It shows that
1 Y-chromosome is essential for sex determination in Drosophila
2 Y-chromosome is female determination in Drosophila
3 Y-chromosome is male determining in human beings
4 Y-chromosome has no roleinsex determination either in Drosophila or in human beings
Explanation:
In Drosophila, XXY represents a female but in human it is an abnormal male. It shows that \(\mathrm{Y}\) chrosomome is crucial for male sex in human. However, Y-chromosome is essential for female sex determination in Drosophila.
AFMC-2007
Principle of Inheritance and Variation
184555
Number of Barr- bodies in XXXX female
1 one
2 two
3 three
4 four
Explanation:
In a female with a XXXX chromosome configuration, there are typically three Barr bodies. Barr bodies are inactivated \(\mathrm{X}\) chromosomes. In females, one of the \(\mathrm{X}\) chromosomes in each cell is randomly inactivated, forming a Barr body. Since there are four X chromosomes in XXXX females, three of them will be inactivated, resulting in three Barr bodies.
BHU PMT (Screening)-2010
Principle of Inheritance and Variation
184556
Gene TDF occurs in
1 Y-chromosome
2 X-chromosome
3 Both \(\mathrm{X}\) and \(\mathrm{Y}\)-chromosomes
4 autosomes
Explanation:
The gene TDF (Testis-Determining Factor) occurs on the Y-chromosome in humans. It is responsible for initiating the development of male characteristics in individuals who inherit it, typically leading to the development of testis and the male reproductive system.
Sex chromosomes are also known as allosomes. Unlike autosomes, which determine most of an individual's traits, allosomes determine an individual's sex. In humans, males typically have one X and one Y chromosome (XY), while females have two \(\mathrm{X}\) chromosomes (XX). These chromosomes play a crucial role in determining an individual's biological sex and the inheritance of sex-linked traits.
AMU-2005 / Manipal-2004
Principle of Inheritance and Variation
184554
Drosophila flies with XXY genotype are females, but human beings with such genotype are abnormal males. It shows that
1 Y-chromosome is essential for sex determination in Drosophila
2 Y-chromosome is female determination in Drosophila
3 Y-chromosome is male determining in human beings
4 Y-chromosome has no roleinsex determination either in Drosophila or in human beings
Explanation:
In Drosophila, XXY represents a female but in human it is an abnormal male. It shows that \(\mathrm{Y}\) chrosomome is crucial for male sex in human. However, Y-chromosome is essential for female sex determination in Drosophila.
AFMC-2007
Principle of Inheritance and Variation
184555
Number of Barr- bodies in XXXX female
1 one
2 two
3 three
4 four
Explanation:
In a female with a XXXX chromosome configuration, there are typically three Barr bodies. Barr bodies are inactivated \(\mathrm{X}\) chromosomes. In females, one of the \(\mathrm{X}\) chromosomes in each cell is randomly inactivated, forming a Barr body. Since there are four X chromosomes in XXXX females, three of them will be inactivated, resulting in three Barr bodies.
BHU PMT (Screening)-2010
Principle of Inheritance and Variation
184556
Gene TDF occurs in
1 Y-chromosome
2 X-chromosome
3 Both \(\mathrm{X}\) and \(\mathrm{Y}\)-chromosomes
4 autosomes
Explanation:
The gene TDF (Testis-Determining Factor) occurs on the Y-chromosome in humans. It is responsible for initiating the development of male characteristics in individuals who inherit it, typically leading to the development of testis and the male reproductive system.