PREZYGOTIC isolating mechanisms ensure that no mating has occurred (sperm is not able to fertilize the egg)
hybrids are not fertile
hybrids are more likely to survive
genes do not mutate and affect the entire population

The process by which natural forces move weathered rock and soil brim one place to another is called

What are genotypes? what are phenotypes?

Coat color in cats is determined by genes at several different loci. at one locus on the x chromosome, one allele (x ) encodes black fur and another allele (xo) encodes orange fur. females can be black (x x ), orange (xoxo), or a mixture of orange and black called tortoiseshell (x xo). males are either black (x y) or orange (xoy). bill has a female tortoiseshell cat named patches. one night, patches escapes from bill\'s house, spends the night out, and mates with a stray male. patches later gives birth to the following kittens: one orange male, one black male, two tortoiseshell females, and one orange female. what are the genotypes of patches, the stray male, and the kittens?