The structure that produces cerebrospinal fluid in the brain is the: MCQ with Answer and Explanation

Explanation:
Pleiotropy occurs when one gene affects multiple seemingly unrelated traits. Example: phenylketonuria (PKU) affects mental development, skin pigmentation, and musty odor. Marfan syndrome affects skeleton, eyes, and heart. Polygenic is many genes affecting one trait, epistasis is gene interaction, codominance is both alleles expressed.

Explanation:
RNA polymerase recognizes and binds to the promoter region of DNA, which is located upstream of the coding sequence. This initiates transcription. The terminator signals the end of transcription. Start codon (AUG) is on mRNA where translation begins. Enhancers are regulatory DNA sequences that increase transcription but are not the primary binding site for polymerase.

Explanation:
Prolactin, secreted by the anterior pituitary, is the primary hormone responsible for milk synthesis (lactation) after childbirth. Oxytocin causes milk ejection (let-down reflex). Estrogen and progesterone stimulate mammary duct and alveolar development during pregnancy but inhibit milk secretion; after delivery, their levels drop, allowing prolactin to act.