Two pink-flowering plants are crossed. the offspring percentages are 25% red, 25% white and 50% pink. if a red-flowering plant was crossed with a white-flowering plant what would the phenotypes of the offspring be?

All the offspring would be of pink color

Explanation:

Let R represents the allele for red color of flower

r represents the allele for white color of flower

Here R  and r can occur co dominantly thereby producing pink color flower with genotype "Rr"

Now , it is given a cross is carried out between a red flowering plant "RR" and a white flowering plant "rr".

The cross between the two parents is represented as below-

RR

rRrRr

rRrRr

Thus, all the offspring would be of pink color

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.