In a population of dogs, the allele for curly hair is dominant over the allele for
straight hair. If two parents are heterozygous for this trait, what percentage of
their offspring is expected to have straight hair?
A. 0%
B. 25%
C. 75%
D. 100 %

B. 25%

Explanation: From the information provided, Curly hair is dominant over straight hair.

Let C represent the allele for curly hair and c represent the allele for straight hair. Two parents that are homozygous for the trait will have a genotype of Cc. Therefore, a cross between them will produce 1 CC, 2 Cc and 1cc. Since straight hair (c) is recessive it must occur in a homozygous state in order to manifest outwardly. Therefore the percentage of offsprings with straight hair is 1/4 x 100 =25%

See attached punnet square for more information

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.

c should be the answer