Test Review

Question 1

Genetic variation = sexual selection

Answer 1

Crossing over, independent assortment, fertilization

Question 2

Three things on phylogenetic tree

Answer 2

They show decent not phenotype

• the branches don’t represent age
• the one taxon by another doesn’t mean they evolved from each other

Question 3

How is genetic variation preservers in population

Answer 3

Diploidy- hiding genetic variation with recessive alleles

Heterzygote advanTage

Question 4

Why not perfect organisms

Answer 4

Only edit existing variations
Limited to historical constraints
Adaption as compromised
Chance, natural selection, and environment interact

Question 5

Biologism barriers that impede members of two species from fertile hybrids

Answer 5

Reproduction Isolation

Question 6

When a zygote is formed, genetic incompatibility may cause development to cease

Answer 6

Reduced hybrid viability

Question 7

Results in extra set of chromosomes

Answer 7

Polyploid

Question 8

Occurs when many new species arise from a single common ancestor

Answer 8

Adaptive radiation

Question 9

Three methods of evidence that scientist use to classfy organism

Answer 9

Fossil evidence
Homologous structures 
Biochemical similarity (DNA)

Question 10

Three major factors to alter allele frequencies

Answer 10

Natural selection, genetic drift, gene flow