In the year 2374, humans finally developed the technology necessary for time travel.  You are a scientist interested in the population genetics of extinct animals.  Taking advantage of this technology advance, you decide to travel back 8 million years to conduct field work in Venezuela.  You are studying a population of Phoberomys pattersoni, the world’s largest extinct rodent weighing approximately 700 kg (1500 lbs) and looking vaguely like a giant guinea pig.  The coat color of this rodent varies between tan (dominant) and brown (recessive).  Assume the population is in Hardy-Weinberg equilibrium.  You observed 336 tan Phoberomys and 64 brown Phoberomys during your study. What is the frequency of the homozygous recessive genotype? ________________ What is the allelic frequency of the dominant (tan) allele in the population? ___________ Of the animals you observed, how many were heterozygous? _______________ As you observe the animals you count 200 brown and 450 tan. Conduct a Chi-square test to determine if your observations are significantly different from what you expect.

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Evolutionary lineages

An evolutionary lineage is a series of populations of organisms that descend from a common ancestor. Each species in the lineage is the direct consequence of evolutionary change from a common ancestor. A phylogenetic tree is generally used to display lineages visually. Lineages are components of the phylogenetic tree of life. Molecular systematics procedures are widely used to predict lineages.