Skin color in a certain species of fish is inherited via a single gene with four different alleles. one fish of this type has al
leles 1 and 3 (s1s3) and its mate has alleles 2 and 4 (s2s4). if each allele confers a unit of color darkness such that s1 has one unit, s2 has two units, and so on, then what proportion of their offspring would be expected to have five units of color?
<span>50%
Since each parent contributes 1 allele to their offspring, we can expect a even distribution of 4 allele combinations in the offspring of these fish. They are
s1s2 = s1 from 1st parent, s2 from 2nd parent
s1s4 = s1 from 1st parent, s4 from 2nd parent
s3s2 = s3 from 1st parent, s2 from 2nd parent
s3s4 = s3 from 1st parent, s4 from 2nd parent
Since both the s1s4 and s3s2 offspring have 5 units of color, that would indicate that 50% of their offspring will have 5 units of color.</span>
The correct answer is (b.) species. Species is a basic unit of macroevolution. Macroevolution focuses more on the changes that occurred in species, it refers to a smaller evolutionary change within a particular species or population.
The correct sequence for the process of forming a human embryo in the diagram above is gamete formation, fertilization, and then the cell division. The process that is correct is number 3.