Khi cho lai giống cà chua đỏ , trộm với cà chua vàng bầu dục người ta thu được F1 toàn quả đỏ tròn tiếp tục cho F1 giao phối với nhau thu được F2 , 901 quả đỏ bầu dục , 301 quả vàng tròn 101 quả vàng bầu dục . Hãy biện luận và viết sơ đồ lai từ P -> f2

Atypical human cell is approximately 12.00 μm in diameter and enclosed by a membrane that is 5.000 nm thick. (a) what is the volume of the cell including the membrane? (b) what is the volume of the cell membrane? (c) what percent of the total volume does its membrane occupy? to simplify the calculations, model the cell as a sphere. enter your answers using four significant figures.

Waianapanapa beach in hawaii is a black-sand beach that was formed by waves crashing against volcanic rock. the sand can be very hot on sunny days. which statement best explains why? o a. the black sand has no heat capacity. b. the black sand absorbs no radiation. o c. the black sand is immune to insolation. d. the black sand has a low albedo.

Aplant may open end close its stomata to prevent excess water loss and maintain