Calculate the offspring genotypic ratio for hair color using the following information: father is a hybrid and mother is a homozygous recessivie for hair color and the dominant hair color is brown (b) and the recessive hair color is blonde(b).

The answer for #3 is c but i don't know why

Ethanol (c2h5oh) is produced from the fermentation of sucrose in the presence of enzymes. c12h22o11(aq) + h2o(g) 4 c2h5oh(l) + 4 co2(g) determine the theoretical yield and the percent yields of ethanol if 680. g sucrose undergoes fermentation and 326.5 g ethanol is obtained. theoretical _ g _ percent %

Which of the following units is not an official si unit