Double fertilization in angiosperms involves the fusion of one male gamete with the egg and the other male gamete with: MCQ with Answer and Explanation

Explanation:
Glomerular filtration rate (GFR) is the volume of filtrate formed per minute by both kidneys, normally about 125 mL/min (180 L/day). Nearly 99% of the filtrate is reabsorbed, leaving about 1-2 liters of urine per day. GFR is regulated by the juxtaglomerular apparatus. It's an important clinical indicator of kidney function, estimated from serum creatinine.

Explanation:
Microtubules are hollow, tube-like structures made of the protein tubulin. They are a major component of the cytoskeleton and play a crucial role in maintaining cell shape, intracellular transport, and cell division by forming the mitotic spindle that separates chromosomes during mitosis and meiosis.

Explanation:
Pleiotropy occurs when a single gene affects two or more distinct phenotypic traits. This happens because the gene product (protein) may be used in multiple biological pathways or expressed in different tissues. Examples include phenylketonuria (PKU), sickle cell anemia, and Marfan syndrome. Epistasis involves the interaction of different genes, polygenic inheritance involves multiple genes affecting one trait, and incomplete dominance is a single gene interaction.