A biologist is studying many interacting populations in a tropical rainforest in Costa Rica. She is studying _____.

Which of the following processes do we associate with all living organisms? Check all that apply. 

A leaf on a tree represents which level of biological organization?

The wing of a bat is used for flying, and the flipper of a dolphin is used for swimming. Evidence from the fossil record indicates that both structures were modified from a front limb that was used for walking in a pre-exisiting ancestor. This is an example of which core concept(s) in biology?

At which level of biological organization would you place a swarm of grasshoppers?

Which of the following components could NOT be found in an animal cell?

Which structure is the site of the synthesis of proteins that will be used within the cell?

The function of the mitochondria in a cell is to

Prokaryotic cell division in bacteria does NOT involve

Cytokinesis usually, but not always, follows mitosis. If cells undergo mitosis and not cytokinesis, this would result in

Which of the following events during meiosis contributes to genetic diversity in a population? Check all that apply,

The stage of meiosis in which chromosomes pair and cross over is

At the end of meiosis in a diploid organism, how many alleles per gene are in a single gamete?

Suppose that a cell is unable to replicate its DNA. Which of the following would NOT be present in this cell?

An animal has two unlinked genes, one for head shape (H) and one for tail length (T). Its genotype is HhTt. Which of the following genotypes represents one possible gamete from this organism?

What is the probability of having a child with a recessive trait if both parents are heterozygous for the trait?

A recessive trait will only be observed in individuals that are ________ for that trait.

The F1 offspring of Mendel's classic pea cross always looked like one of the two parental varieties because

The form of inheritance where the heterozygous state is expressed as an intermediate (e.g. red and white flowers make pink flowers) is known as __________________.

When a homozygous dominant individual is crossed with a homozygous recessive individual, what percentage of the F1 offspring will be heterozygous?

For natural selection to result in evolutionary change,

This type of reproductive (barrier) isolating mechanism prevents a zygote from developing into a viable and fertile individual.

One species of Panamic porkfish (Anisotremus taeniatus) is found in the Pacific Ocean, while another species of porkfish (Anisotremus virginicus) is found in the Caribbean Sea. These two species were derived from ancestral species who population split by the formation of the Isthmus of Panama about 3.5 mya. Before the geological event, the waters mixed freely between the Pacific Ocean and Caribbean Sea. Which mechanism of speciation led to these two distinct species?

What phenomenon would violate the conditions for Hardy-Weinberg equilibrium?

What mechanism leads to changes in allele frequencies due to random chance?

Which type of selection results in greater genetic variance in a population?

How many alleles do diploid organisms have for each of their genes?

Most Swiss starlings produce four to five eggs in each clutch (the set of eggs laid at a given time). Starlings producing fewer or more than this have reduced fitness. Which of the following terms best describes this situation?

Which of the following conditions must be met for a population to be in Hardy-Weinberg equilibrium? Check all that apply.

The science of describing, naming and classifying living and extinct species is called

What is true about organisms that are a part of the same monophyletic group?

Based on this figure, Humans and Drosophila (flies) last shared a most recent common ancestor around:

Is a lizard more closely related to a frog or a human?

Based on the tree below, which statement is not correct?

When grouping organisms, which classification is the most general for a particular type of organism?