CELL DIVISION
MEIOSIS AND GENETIC VARIATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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XY, XX
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XX, XY
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XO, XX
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XY, YY
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Detailed explanation-1: -Each person normally has one pair of sex chromosomes in each cell. The Y chromosome is present in males, who have one X and one Y chromosome, while females have two X chromosomes.
Detailed explanation-2: -The twenty third pair is called the sex chromosomes, while the rest of the 22 pairs are called autosomes. Typically, biologically male individuals have one X and one Y chromosome (XY) while those who are biologically female have two X chromosomes. However, there are exceptions to this rule.
Detailed explanation-3: -A few 47, XXY cases with a female phenotype have been reported. These individuals have positive SRY (testis-determining factor). The genetic explanation of this phenomenon is unclear. Case: A 34-year-old woman presented with testicular feminization and a 47, XXY karyotype.