BIOLOGY

Monday

6 Mar 2017

Entry TaskWhat does it mean when a populations allele frequency changes

from 20% to 30%?

• The population is evolving.

What are the three sources of genetic variation?

• Mutations

• Genetic Recombination in Sexual Reproduction

• Lateral Gene Transfer

Agenda Housekeeping

Genetic Change in Populations

Process of Speciation

HousekeepingProgress reports will be emailed tonight.

• Quarter ends Friday, 31 Mar.

Chpt 16 & 17 scheduled for 9 Mar.

• Kahoot review on Wednesday, 8 Mar.

Teacher training day scheduled for Friday, 10 Mar.

• “No School”

Genes & VariationsGenes, populations, & gene pools.

Sources of genetic variations.

Calculating allele frequencies.

Single-gene & polygenic traits & the effects of natural selection.

p. 482-488

Natural SelectionDirectional Selection:

• Individuals at one end have

higher fitness.

• Range of phenotype shifts.

Stabilizing Selection:

• Individuals near the center have

higher fitness.

• Curve keeps its current position.

p. 489

Natural SelectionDisruptive Selection:

• Individuals at the outer ends

have higher fitness.

• If natural selection is strong &

lasts long enough creates two

distinct phenotypes.

p. 489

Genetic DriftGenetic Drift = random change in allele frequency.

• Occurs in small populations

• Chance occurrence can cause an allele to become more or

less common.

Changes in allele frequency can also occur due to:

• Genetic Bottlenecks

• The Founder Effect

p. 490

Genetic DriftGenetic Bottlenecks:

• Change in allele frequency following a dramatic reduction in

the size of population.

The Founder Effect:

• Change in allele frequency due to the migration of a small

subgroup of a population.

p. 490

Genetic EquilibriumGenetic Equilibrium:

• Allele frequencies in a gene pool remain the same.

The Hardy-Weinberg Principle:

• Way of predicting genotype frequencies in a population.

• 5 conditions can disturb genetic equilibrium & cause

evolution:

- Non-random mating - Mutations

- Small population size - Natural selection

- Immigration/Emigration

p. 491-492

Speciation MechanismsReproductive Isolation:

• Two population become reproductively isolated & can no

longer breed.

• Leads to new species.

Develops in a variety of ways:

• Behavioral Isolation

• Geographic Isolation

• Temporal Isolation

p. 494

Speciation MechanismsBehavioral Isolation:

• Differences in courtship rituals

or other behaviors.

p. 495

Speciation MechanismsBehavioral Isolation:

• Differences in courtship rituals

or other behaviors.

p. 495

Geographic Isolation:

• Separated by geographic barriers such

as rivers, mountains, or bodies of water.

Speciation MechanismsTemporal Isolation:

• Two or more species reproduce at different times.

p. 495

Darwin’s Finches

p. 496-497

Speciation in Galapagos finches occurred by founding of a new

population, geographic isolation, changes in the new

population’s gene pool, behavioral isolation, & ecological

competition.

BIOLOGY

Tuesday

7 Mar 2017

Entry TaskWhat type of inherited structure has lost most or all of its original

function?

• Vestigial.

What is the principle of common descent?

• All species - living & extinct - are descended from an ancient

common ancestor.

According to natural selection, individuals that survive are those

with variations best suited for their ___________.environment

Agenda Housekeeping

Chpt 16 & 17 Study Guide

HousekeepingChpt 16 & 17 scheduled for 9 Mar.

• Kahoot review on Wednesday, 8 Mar.

Teacher training day scheduled for Friday, 10 Mar.

• “No School”

Study GuideGrab one & pass the rest back.

The following will be collected on the day of the exam:

• Study Guide

• Chpt 17 Workbook (if you did not turn it in already)

BIOLOGY

Wednesday

8 Mar 2017

Entry TaskGrab a computer & log in (you can use your mobile device if you

prefer).

• Once logged in open Google Chrome & go to www.Kahoot.it

• Wait until I give the entry code.

Agenda Housekeeping

Kahoot Review

HousekeepingChpt 16 & 17 exam tomorrow, 9 Mar.

Teacher training day scheduled for Friday, 10 Mar.

• “No School”

KahootLink: www.Kahoot.it

• Nickname must be appropriate & include initials at the end.

You can review this Kahoot by creating your own account and

searching for the following name.

• Link: https://getkahoot.com/

• Name: Biology Chpt 16&17 Genetics

BIOLOGY

Thursday

9 Mar 2017

Entry TaskPlace your bags on or in front of the counters along the wall.

At your desk you will need…

• Pencil/Pen (Blue or Black Ink).

• Eraser.

• Chpt 17 workbook & chpt 17 study guide for turn in.

Exam 8Verify your name is in the upper left corner of your answer

sheet.

Fill in circle 1 if you have test version ID:A & 2 if you have ID:B.

Remember…

• No talking.

• Keep your eyes on your own answer sheet.

• NO electronics.

When you are finished…

• Check to make sure you thoroughly answered all questions.

• Staple you answer sheet to the front of the exam & turn in.

• Silently read or complete any missing assignments.

Agenda Housekeeping

HousekeepingTeacher training day tomorrow, 10 Mar.

• “No School”

Substitute on Wednesday & Thursday (22-23 Mar).

• Chpt 3 workbook.

Substitute on Monday, 27 Mar.

• Study guide.

Chpt 3 exam scheduled for Tuesday, 28 Mar.

Substitute Wednesday through Friday (29-31 Mar.)

• Early release schedule

BIOLOGY

Friday

10 Mar 2017

“No School”Teacher Training Day.