Ecol - Ch 6 Evolutionary Ecology

​ (a)   are regions on the DNA strand that carry the code for a trait. ​ (b)   are the possible variations of a trait. For example, ​ (c)   #1 may be the ​ (d)   for the​ for fur color. The alleles for fur color may be ​ (e)   .

• Genes
• Alleles
• location
• white or brown
• chromosome

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

Unless siblings are identical twins, two parents will never produce identical children. How is there so much genetic variation among the offspring of two parents?

1)​ (a)   = parents' pairs of chromosomes are randomly sorted into egg & sperm​ (b)  

2)​ (c)   = DNA swaps occur among a parent's chromosomes during ​ (d)   before egg & sperm form

• random assortment
• recombination
• (gametes)
• meiosis

Tags

NGSS.HS-LS3-2

The diagram shows new offspring genetic variation created during which event of meiosis

• random assortment of new chromosomes into 4 new cells

• recombination of sections of DNA during DNA replication

• don't pick me

Tags

NGSS.HS-LS3-2

The diagram shows new offspring genetic variation created during ....

• random assortment of new chromosomes into 4 new cells

• recombination of sections of DNA during DNA replication

• don't pick me

Tags

NGSS.HS-LS3-2

This organism's diploid adult cells have ___ pairs of homologous chromosomes that can sort into ___ different arrangements before the cell splits to make haploid gametes (egg or sperm).

FYI: A human cell can sort into

2²³ or over 8,388,608 possible arrangements to form egg or sperm.

• 3 / 8

• 6 / 16

• 12 / 8

Tags

NGSS.HS-LS3-2

Genetic drift occurs when the allele variation in a gene pool decreases.

Match the forms or examples.

• pop. drops

  gene pool shrinks

• water hyacinth transplanted to other countries

• bottleneck effect

• elephant seal pop. drops from hundred thousands to 20

• founder effect

• founder effect

• newly isolated pop. has small gene pool

• bottleneck effect

Selection is when certain phenotypes (traits) survive and are passed on, while other phenotypes decrease survival.

Match the types

• phenotype shifts to one extreme or other

• Disruptive selection

• middle decreases and both ends increase

• Stabilizing selection

• middle phenotypes increase

• Directional selection

Tags

NGSS.HS-LS4-4

3 types of selection (change in phenotypes w/in population)

• phenotype shifts one side to other

• 
• middle phenotypes increase

• 
• extremes both increase

  middle decreases

• 

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NGSS.HS-LS4-2

NGSS.HS-LS4-4

​ (a)   occurs at the ​ (b)   level.

It can be artificial when humans are responsible for​ (c)   agricultural plants domesticated animals. It can also be caused by ​ (d)   , such as limiting hunting of the white deer enclosed at the Seneca Army Depot.

• Microevolution
• population
• breeding
• selective hunting

Tags

NGSS.HS-LS3-2

Microevolution occurs when the peppered moth population shifts between the white and black phenotype. During the industrial revolution, when soot builds up on the tree trunks, there is selective pressure toward which phenotype?

• 
• 
• don't pick me

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-3

NGSS.HS-LS4-4