When calculating the concentration of bacteria in a liquid culture, you should plate multiple dilutions of your culture then count the colonies that develop on only one of those plates.  The plate that you count should contain between 30 and 300 colonies.  Should you avoid using plates with fewer than […]

Imagine you do a test cross between a purple-flowered pea plant having serrated leaves (a dominant trait) and a white-flowered pea plant having smooth edges. If the purple-flowered plant is heterozygous for both traits, the expected ratio in the offspring is 1 purple-serrated: 1 purple-smooth:1 white-serrated:1 white-smooth. Instead, you see […]

Hair and Eye Color In Scandinavia, people who do not have blond hair and blue eyes stand out. A study considered hair and eye color in families from Copenhagen, Denmark. In each of 50 families, one partner has the common blond hair and blue eyes, while the other partner has […]

Q. Scientists recently have proposed a reorganization of the phylogenetic system of classification to include the domain, a new taxonomic category higher (more inclusive) than the Kingdom category. • explain how this classification scheme presents different conclusions about the relationships among living organisms than those presented by the previous five-kingdom […]