Biology Questions

which of the following describes a mechanism for generating more genes

which one of the following choices describes an advantage of the biological species concept

the most important feature tat permits a gene to acta s a moilecular clock

In Figure 20.3, phylogeny branch lengths represent genetic changes. Which organism on the tree has undergone the most genetic changes since divergence from common ancestor?

Soon after the island of Hawaii rose above the sea surface (somewhat less than one million years ago), the evolution of life on this new island should have been most strongly influenced by _____.

If the original finches that had been blown over to the Galapagos from South America had already beengenetically different from the parental population of South American finches, even before adapting to theGalapagos, this would have been an example ofA) genetic drift.B) bottleneck effect.C) founderʹs effect.D) all three of theseE) both A and C

Assuming chimps and gorillas are humans' closest relatives, removing humans from the great ape clade and placing them in a different clade has the effect of making the phylogenetic tree of the great apes

Members of two different species possess a similar-looking structure that they use in a similar fashion toperform the same function. Which information would best help distinguish between an explanation based onhomology versus one based on convergent evolution?A) The two species live at great distance from each other.B) The two species share many proteins in common, and the nucleotide sequences that code for theseproteins are almost identical.C) The sizes of the structures in adult members of both species are similar in size.D) Both species are well adapted to their particular environments.E) Both species reproduce sexually.

The following question refers to the evolutionary tree belowe. Based on this finding, it is reasonble to conclue

The frequency of individuals born in a population with PKU is q2. There is one PKU (q2) birth per 10,000 births. The frequency of the recessive allele for PKU in this population is q = 0.01. The frequency of the dominant allele in this population is p = 1 — q = 0.99. What is the frequency of carriers (2pq) in this population?

natural selection changes allele frequencies

mountains have an unmatched power to drive human evolution

There are 25 individuals in population 1, all with genotype AA, and there are 40 individuals in population 2, all with genotype aa. Assume that these populations are located far from each other and that their environmental conditions are very similar. Based on the information given here, the observed genetic variation most likely resulted from

Traditionally zooologists taxonomically what shoul be don with the birds

there is still controversy among biologists

In those parts of equatorial Africa where the malaria parasite is most common, the sickle-cell allele constitutes 20% of the β hemoglobin alleles in the human gene pool. considering the overall

the upper forelimbs of humans and bats have fairl similar skeletal strutures

which of the following factors would not contribute to allopatric speciation

Traditionally, whales and hippopotamuses have been classified in different orders, the Cetacea and the Artiodactyla, respectively. Recent molecular evidence, however, indicates that the whales' closest living relatives are the hippos. This has caused some zoologists to lump the two orders together into a single clade, the Cetartiodactyla. There is no consensus on whether the Cetartiodactyla should be accorded order status or superorder status. This is because it remains unclear whether the whale lineage diverged from the lineage leading to the hippos before or after the other members of the order Artiodactyla (pigs, camels, etc.) diverged.placing whales and hippos in same clade means

the most likely explanation for the high rate of sympatric speciation that