As energy is converted from one form to another, unusable energy is released as ______.

Attached earlobes are recessive to free earlobes. What genotypic ratio is expected when an individual with attached earlobes mates with an individual heterozygous for free earlobes?

Hypophosphatemia (vitamin D—resistant rickets) is inherited as a sex-linked dominant trait. The relevant gene is found on the X chromosome. What is the expected outcome of a cross between a homozygous recessive woman and a man with hypophosphatemia?

According to Mendel’s law of segregation, ________.

If the frequency of one allele in a population is 0.91 in a population with two alleles at a particular locus, what is the frequency of the alternate allele?

If seed production had never evolved, which organisms would be missing in today’s landscape?

This graph represents three different populations. Use it to answer the following questions.Which population is growing at the fastest rate?

Read the following scenario to answer the following questions.In some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called “ligers.” Male ligers are sterile but some female ligers are fertile. In the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. Furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences.The natural differences in the ranges of wild tigers and lions is an example of ________.

Which of these is a defining characteristic of animals that distinguishes them from other eukaryotes?

Which of the following is the strongest piece of evidence for why some scientists believe that we are at the start of a sixth mass extinction?