Tightly curled hair is caused by a dominant autosomal gene in humans. This trait is rare among northern Europeans. If a curly-haired northern European marries a person with straight hair, what phenotypes (and in what proportions) are expected in the offspring?

a.1/2 curly (because the curly-haired individgal is most likely heterozygous) 1/2 straight hair
b.1/2 curly (because the curly-haired individual is most likely homozygous), 1 /2 straight hair
c. all curly (because the curly-haired individual is most likely heterozygous)
d.3/4 curly (because the curly-haired individual is most likely heterozygous), 1/4 straight hair

Option A: 1/2 curly (because the curly-haired individual is most likely heterozygous) 1/2 straight hair

Explanation:

Tightly curled hair is caused by a dominant autosomal gene in humans, ca either be homozygous or heterozygous dominant.

A curly haired individual that is heterozygote crossed with a person with straight hair will produce 1/2 curly and 1/2 straight

        Cc (curly heterozygote)   x    cc (straight)

                                50%Cc and 50%cc

                                  1/2 curly and 1/2 straight

they have identical fossils of organisms that have evolved over time.

both have animal fossils preserved in them due to weathering and erosion.

they contain different fossils because life on earth has changed through time.

the fossils in them were formed on the surface of earth due to exposure to sunlight.