The disorder caused by an extra X chromosome in males (XXY) is:
A. Turner syndrome
B. Klinefelter syndrome
C. Down syndrome
D. Cri du chat syndrome
Answer: Option B
Solution (By JKSSB Mock Tests)
Klinefelter syndrome (47,XXY) is a sex chromosome aneuploidy causing male hypogonadism, tall stature, gynecomastia, and infertility. Turner syndrome (45,X) affects females. Down syndrome is trisomy 21. Cri du chat is deletion in chromosome 5. Nondisjunction during meiosis leads to these aneuploidies.
Explanation:
Stem bears leaves and reproductive structures. It is positively phototropic (grows towards light). Leaves are the main photosynthetic organs. Roots grow downward.
Explanation:
Lycopene is a red carotenoid pigment that accumulates in ripe tomatoes and watermelon. Beta-carotene is orange, chlorophyll green, anthocyanin purple/red in some plants.
Explanation:
The loop of Henle, especially the descending limb (permeable to water) and ascending limb (impermeable, active salt transport), creates an osmotic gradient in the medulla. This countercurrent multiplier system enables the kidney to produce concentrated or dilute urine depending on hydration status. ADH acts on the collecting duct to utilize this gradient.
No comments yet. Be the first to start the discussion!