A brown-eyed man whose father was brown-eyed and whose mother was blue-eyed, married a blue-eyed woman whose father and mother w
ere both brown-eyed. The couple has a blue-eyed son. If brown eyes are dominant over blue eyes, for which of the individuals do you know the genotypes for sure? What are they? What genotypes are possible for the others?
Answer: it’s more likely due the brown alele is dominant.
But it depends on the genotype, because she can be a carrier of the blue gene. In the simplest models of eye color, there are two genes involed (this is a simplified model).
Gene 1 there are two possibilities brown or blue. The brown version of the gene 1 is dominant over the blue one. Dominant means is if a least 1 of your copies is brown. then you will have brown eyes.
Gene 2. there are two possibilities, green or blue. Green is dominant over blue,
The endomembrane systemis a group of membranes and organelles in eukaryotic cells that works together to modify, package, and transport lipids and proteins.
Carbon dioxide is the waste product of cellular respiration that you breathe out each time you breathe. Blood picks up oxygen and releases carbon dioxide in the lungs. The opposite takes place in the cells where the blood releases oxygen and picks up carbon dioxide.
Allele frequencies in a population may change due to four fundamental forces of evolution: Natural Selection, Genetic Drift, Mutations and Gene Flow. Mutations are the ultimate source of new alleles in a gene pool. Two of the most relevant mechanisms of evolutionary change are: Natural Selection and Genetic Drift.
