Flower diameter in sunflowers is a quantitative trait. a plant with 6-cm flowers, from a highly inbred strain, is crossed to a plant with 30-cm flowers, also from a highly inbred strain. the f1 have 18-cm flowers. f1 × f1 crosses yield f2 plants with flowers ranging from 6 to 30 cm in diameter, in approximately 4-cm intervals (6, 10, 14, 18, 22, 26, 30). an 18-cm f1 plant is crossed to a 6-cm plant. what is the probability of an offspring with one additive allele, if all genes that influence this trait are unlinked?

a. 1/3
b. 1/4
c. 1/6
d. 3/8
e. 1/16

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.

this is more of a statement than a question. is there answers to go along with this, or is it opinion based?

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.