Over the course of millions of years various environments have changed. As grasslands slowly took the place of forests the inhabitants were forced to adapt or they went extinct. During this time period the horse evolved from a small cat sized creature to the size of the modern horses we see today. This is an example of which type of natural selection

Match the following terms and definitions. 1. transcription when genes are neither dominant nor recessive and display a blending of traits in the phenotype 2. translation converting the genetic code into the language of proteins 3. monohybrid cross genes that are carried on the x chromosome 4. incomplete dominance the transfer of genetic code from dna to an rna molecule 5. sex-linked genes the breeding of two organisms which differ in a single trait

Why do you think the puppy litter was all dark-haired?

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area