Apurebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds. the f1 plants have yellow seeds. what is the expected phenotypic ratio of seed color of the offspring of an f1 × f1 cross?

3 yellow : 1 green

Explanation:

Let yellow seed trait be represented by Y allele and green seed trait by y allele.

Purebred yellow seed plant = YY

Purebred green seed plant = yy

YY   x    yy  = Yy, Yy, Yy, Yy (all yellow)

This thus means that yellow seed trait is dominant over green seed trait.

F1  x   F1 = Yy  x   Yy, resulting in YY, Yy, Yy, yy offspring.

Since Y is dominant over y,

YY, Yy, Yy = Yellow

yy  = green

Hence, the expected phenotypic ratio of seed color of the offspring of F1 x F1 cross is 3 yellow : 1 green

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.