Suppose that a dominant allele (p) codes for a polka-dot tail and a recessive allele (p) codes for a solid colored tail. in addition, suppose that a dominant allele (l) codes for long eyelashes and a recessive allele (l) codes for short eyelashes. if two individuals heterozygous for both traits (tail color and eyelash length) mate, what's the probability of the phenotypic combinations of the offspring?
a. 9: 3: 3: 1 ratio (9 polka-dot tails and long eyelashes, 3 polka-dot tails and short eyelashes, 3 solid tails and short eyelashes, 1 solid tail and short eyelash)
b. 9: 3: 3: 1 ratio (9 polka-dot tails and short eyelashes, 3 polka-dot tails and short eyelashes, 3 solid tails and long eyelashes, 1 solid tail and long eyelash)
c. 1: 1 ratio (half are polka-dot tails and long eyelashes; half are solid tails and short eyelashes) d. 1: 1 ratio (half are polka-dot tails and short eyelashes; half are solid tails and long eyelashes)

Answer is  A.

This is an example Mendel’s dihybrid cross.The law of independent assortment of independent assortment. When two individuals heterozygous for both traits (tail color and eyelash length) having genotype (PpLl) are crossed, four types of individuals are produced. The probability of phenotype combinations of offspring is the ratio 9:3:3:1.

9 - polka-dot tails and long eyelashes

3 - polka-dot tails and short eyelashes

3 - solid tails and long eyelashes  

1- solid tail and short eyelash

the answer is:

carbon dioxide

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.