If a man who is heterozygous for blood type A marries a woman who is heterozygous for blood type B, what is the predicted phenotypic ratio of their offspring?

Blood types: AB, A, B, and O in ratio 1:1:1:1

Explanation:

The ABO blood group system is employed in Humans. The alleles for blood type A (A) and blood type B (B) are dominant over the allele for blood type O (O).

If a man who is heterozygous for blood type A (AO) marries a woman who is heterozygous for blood type B (BO), the following gametes will be produced by each parent:

AO - A and O

BO - B and O

Using these gametes in a punnet square, the following proportions of offsprings will be produced:

Blood type AB - 1/4

Blood type A - 1/4

Blood type B - 1/4

Blood type O - 1/4

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

that scientist would be robert hooke