SME
Grade 9 Science · Problem type
Common ancestry on a cladogram
Use this for “Which two animals are most closely related?”
Explore
Jaws appeared after the lamprey split off, so every taxon but the lamprey has them.
Assumptions
•
Each mark is where a shared derived trait first appeared; every taxon above that branch inherited it.
•
Taxa that split later share a more recent common ancestor, so they are more closely related.
•
A clade is an ancestor and all of its descendants.
← Previous lesson
Homologous, analogous or vestigial?
Next lesson →
How bacteria become resistant to an antibiotic
Topic check
See what you know: 5 questions on this topic
New questions each time. Pass to mark it complete.
Refresh
Related lessons
Evidence for evolution, population genetics and speciation
Main lesson
Allele frequencies from genotype counts
Use this for “A sample has 49 AA, 42 Aa and 9 aa. What are p and q?”
Homologous, analogous or vestigial?
Use this for “Which forelimb is not homologous to the others?”
How bacteria become resistant to an antibiotic
Use this for “Why does overusing antibiotics lead to resistant bacteria?”
How one species becomes two
Use this for “Put the steps of speciation after a population is split in order.”
What changes allele frequencies?
Use this for “Which condition would change the allele frequencies in a population?”