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In human males all the chromosomes are paired perfectly except
(i) 21st chromosome
(ii) Y chromosome
(iii) small chromosome
(iv) X chromosome
(i) 21st chromosome
(ii) Y chromosome
(iii) small chromosome
(iv) X chromosome
- a)(i) and (ii)
- b)(ii) and (iii)
- c)(iii) and (iv)
- d)(ii) and (iv)
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
In human males all the chromosomes are paired perfectly except(i) 21st...
In human there are 23 pairs of chromosomes. In males, out of 23 pairs one pair contains sex chromosomes that are X and Y chromosome. X chromosome is bigger than Y chromosome. Therefore the 23rd pair is not paired perfectly
Community Answer
In human males all the chromosomes are paired perfectly except(i) 21st...
In human males, the chromosomes are paired perfectly except for the Y chromosome. Let's break down the options and understand why the correct answer is option 'D'.
(i) 21st chromosome:
The 21st chromosome is known as the "Trisomy 21" or the "Down Syndrome" chromosome. In individuals with Down Syndrome, there is an extra copy of the 21st chromosome, resulting in a total of three copies instead of the normal pair. However, this does not affect the pairing of chromosomes in human males, as it is not directly related to sex determination.
(ii) Y chromosome:
The Y chromosome is one of the two sex chromosomes in humans, with the other being the X chromosome. Unlike other chromosomes, the Y chromosome does not have a matching pair in males. Instead, males have one X chromosome and one Y chromosome. The Y chromosome carries the genetic information that determines male sex characteristics and is responsible for initiating the development of male reproductive organs.
(iii) Small chromosome:
The term "small chromosome" is quite broad and doesn't refer to a specific chromosome. It is important to note that all chromosomes, except the sex chromosomes (X and Y), come in pairs. Individuals have two copies of each autosome (non-sex chromosomes), one inherited from the mother and one from the father. Therefore, it is incorrect to say that all chromosomes are paired perfectly except for a "small chromosome" since all non-sex chromosomes are paired.
(iv) X chromosome:
The X chromosome is one of the two sex chromosomes in humans. Females have two X chromosomes, while males have one X chromosome and one Y chromosome. The X chromosome carries a wide range of genes that are responsible for various traits and characteristics. It is important to note that the X chromosome in males is not perfectly paired with another X chromosome, as females do. Instead, males have a single X chromosome.
Therefore, the correct answer is option 'D' because the Y chromosome (ii) and the X chromosome (iv) are the only chromosomes that are not perfectly paired in human males.
(i) 21st chromosome:
The 21st chromosome is known as the "Trisomy 21" or the "Down Syndrome" chromosome. In individuals with Down Syndrome, there is an extra copy of the 21st chromosome, resulting in a total of three copies instead of the normal pair. However, this does not affect the pairing of chromosomes in human males, as it is not directly related to sex determination.
(ii) Y chromosome:
The Y chromosome is one of the two sex chromosomes in humans, with the other being the X chromosome. Unlike other chromosomes, the Y chromosome does not have a matching pair in males. Instead, males have one X chromosome and one Y chromosome. The Y chromosome carries the genetic information that determines male sex characteristics and is responsible for initiating the development of male reproductive organs.
(iii) Small chromosome:
The term "small chromosome" is quite broad and doesn't refer to a specific chromosome. It is important to note that all chromosomes, except the sex chromosomes (X and Y), come in pairs. Individuals have two copies of each autosome (non-sex chromosomes), one inherited from the mother and one from the father. Therefore, it is incorrect to say that all chromosomes are paired perfectly except for a "small chromosome" since all non-sex chromosomes are paired.
(iv) X chromosome:
The X chromosome is one of the two sex chromosomes in humans. Females have two X chromosomes, while males have one X chromosome and one Y chromosome. The X chromosome carries a wide range of genes that are responsible for various traits and characteristics. It is important to note that the X chromosome in males is not perfectly paired with another X chromosome, as females do. Instead, males have a single X chromosome.
Therefore, the correct answer is option 'D' because the Y chromosome (ii) and the X chromosome (iv) are the only chromosomes that are not perfectly paired in human males.
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In human males all the chromosomes are paired perfectly except(i) 21st chromosome(ii) Y chromosome(iii) small chromosome(iv) X chromosomea)(i) and (ii)b)(ii) and (iii)c)(iii) and (iv)d)(ii) and (iv)Correct answer is option 'D'. Can you explain this answer?
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