Stabilizing Selection
Huntington disease is autosomal dominant, meaning that individuals who inherit one copy of the mutant allele from either parent will develop the disease. Thus, individuals with Huntington's disease are heterozygous for the mutant allele. Homozygous individuals would not survive past a certain age due to the severity of the disorder.
This would be survival of the fittest and evolution at work. Because the gray mice are harder for the birds to see, they live to reproduce and pass their genes for color on. This is why most wild mice are gray in color, while domesticated mice are a variety of colors. Domesticated mice were bred to be pretty, while the wild mice breed for survival.
Darwin called the ability of an organism to survive and reproduce in its environment fitness.
A species must be able to find food, shelter, and water in order to survive and reproduce. Until a species is able to meet its essential needs, it is not able to reproduce and survive.
To survive, they must.
To survive and reproduce.
All animals must reproduce in order to survive.
poopy
To survive and reproduce.
It is an organism's ability to survive and reproduce.
Survive and reproduce.
warmness