The disease caused by the deficiency of vitamin B₁₂ and folate leads to: MCQ with Answer and Explanation

Explanation:
Klinefelter syndrome is a sex chromosomal aneuploidy in males characterized by the karyotype 47, XXY. Individuals are phenotypically male but often exhibit feminine characteristics such as gynecomastia (development of breasts), sparse body hair, and are typically sterile due to underdeveloped testes. Down syndrome is trisomy 21 (47, +21), Turner syndrome is 45, X0, and Patau syndrome is trisomy 13.

Explanation:
Acidosis is a condition of decreased blood pH (7.45). Homeostasis is maintenance of stable internal environment. Apoptosis is programmed cell death. Acidosis can be respiratory (due to CO₂ retention) or metabolic (due to accumulation of acids like lactic acid or ketone bodies).

Explanation:
The epididymis is a coiled tube on the testis where sperm mature and are stored. Seminal vesicles and prostate add fluid, vas deferens transports sperm.