Biology Questions

The majority of oxygen that exists in our atmosphere came from

Microfossils with cells that appear to have nuclei would indicate what domain of life?

According to plate tectonics, for the past 560 million years, the continents that we see today

Is mutation alone likely to make much of a difference in the coat color of the entire rock pocket mouse population?

Which free living cells were the earliest contributors to the formation of Earth's oxidizing atmosphere?

An earthquake wipes out a mainland population of a small flowering herb with highly variable flower shapes. A small remnant contains the seven remaining plants in the population. The most likely outcome for the population as a result of this is

Speciation that can occur in a sexually reproducing species split into two populations by a geographic barrier to gene flow is best described as

You examine fossils of extinct trilobites. All the specimens look identical and were collected from the same fossil bed. They are members of the same

You survey Population A again several years later to find one individual of this damselfly species with a metallic blue color. Which evolutionary mechanism is most likely to have been responsible for this development?

If a mating population contains two alleles, A1 and A2 with the following frequencies: f(A1) = p = 0.7 f(A2) = q = 0.3If the population is in HWE, what will be the frequency of the heterozygous genotype A1A2 in the offspring?

Red short-horned cattle are homozygous for the red allele, white cattle are homozygous for the white allele, and roan cattle are heterozygotes. Population A consists of 36% red, 16% white, and 48% roan cattle. What are the allele frequencies?

How can you tell if a population is in HWE? The population is in HWE if p + q = 1The population is in HWE if p^2 + 2pq + q^2 = 1The population is in HWE if the genotype frequencies are p^2, 2pq, and q^2None of these are mathematical indications that a population is in HWE

The effect of mutation on a population (select all that apply)

If evolution were noticeably occurring in one of these opossum populations, its causes include

Acting alone, which mechanism of evolution has the least impact on allele frequencies?SelectionMutationGene flowGenetic drift

Blind Mexican cavefish (Astyanax mexicanus) live in caves and do not have eyes as adults (though they do form eyes during development). The cave fish diverged from a surface-dwelling population which does have eyes. The cave fish have extremely low genetic diversity compared to their surface-dwelling close relatives (pictured below). This observation is best explained by:

Is mutation the only factor that could influence evolution of these mice in this environment?

Which mechanism of evolution results from interbreeding after migration of one population into an area containing another population?Genetic driftGene flowNon-random matingMutationSelectionNone of these

In our body's cells, the HLA (Human leukocyte antigen) genes encode cell surface proteins that play a key role in our immune system recognizing foreign pathogens. The greater the diversity of HLA genes we have, the greater variety of pathogens our immune system will be able to recognize and attack. What kind of selection do you think best describes the evolutionary history of HLA genetic diversity in the human population?

Pregnancy in Momma- do we as catholics approve contraception?