Category: Biology

Posts for EDHS Biology

First Five March 27

What natural factors control the numbers in a population? Why is the human population a concern to many people and our planet?

Posted in Biology, First Fives

First Five March 23/24

How many people live in the City of Visalia? Explain how we could we use this information to make projections for the future? What is a population? What challenges do rapidly growing populations like Visalia present?

Posted in Biology, First Fives

First Five March 21/22

 What is the source of NEW genetic variation? Why is this important in regards to natural selection?  Explain how migration (gene flow), genetic drift, and natural selection each effect allele frequencies?

Posted in Biology, First Fives

First Five March 20

Which model explains  that evolution happens in small sudden changes? Why would this model explain the lack of transitional fossils in the fossil record? What questions about evolution and the process of natural selection do you still have?

Posted in Biology, First Fives

First Five March 16/17

In a population with two alleles, A and a,  the  allele frequency of a is 0.3.  What is the frequency of heterozygotes in the population if the population is in Hardy-Weinberg equilibrium? Why is natural selection NOT considered a random

Posted in Biology, First Fives

First Five March 14/15

1. What are geographic isolation and reproductive isolation? Give an example of each. 2. Why do some scientists use the term “lucky individuals” in describing genetic drift.

Posted in Biology, First Fives

First Five March 13

Explain how gene flow is different from genetic drift in impacting populations of organisms. If 25% of a population shows a recessive phenotype, what is the allele frequency for that recessive gene?

Posted in Biology, First Fives

First Five March 9/10

Use the cladogram to answer the question below. 1. Which of the following conclusions about the evolutionary relationships of species A–H can be drawn from the cladogram shown? Explain your choice in a complete sentence. A. Species F is more closely

Posted in Biology, First Fives

First Five March 7/8

Describe what is happening to the environment for each of the three types of natural selection.

Posted in Biology, First Fives

First Five March 6

 Is evolution a random or non-random process? Explain. What characteristics makes a group of organisms unique enough to be called a  species?

Posted in Biology, First Fives