2. If red (R) and white (r) are codominant alleles that determine flower color, what
phenotypes are possible for this gene?
A. Red and white
B. Pink only
C. Red, white, and pink
D. Red, white, and red-white
spotted

D. Red, white, and red-white  spotted

Explanation:

Co-dominance is when neither allele is dominant, and both are expressed. That means you would see patches of both red and white if the individuals were heterozygous, so D is correct.

In incomplete dominance, one allele is not entirely dominant over the other. giving an intermediate or blended phenotype between the two traits, this would result in a pink phenotype if the individuals were heterozygous.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.