Question

value: 10
what is the best evidence we have for evolution?
○ a. fossil record
○ b. homologies
○ c. embryology
○ d. dna and rna sequence
○ e. the textbook

value: 10
bird wings and the pectorial fins of whales are ___ structures.
○ a. analogous
○ b. homologous
○ c. vestigal
○ d. homozygous

value: 10
if three species share the same genetic sequence for a gene, then you could conclude that the ____.
○ a. all three species had the mutation occur at different times
○ b. genetic sequence would be the same in all other species
○ c. share a common ancestor
○ d. that the genetic sequence did not function in these organism

Explanation:

• First question: The fossil record provides direct physical evidence of past life forms and their evolution over time. Homologies, embryology, and DNA/RNA sequences also support evolution but are more indirect or specific aspects. A textbook is a source of information, not evidence.
• Second question: Bird wings and whale pectoral fins are homologous structures. They have a similar underlying skeletal structure (derived from a common tetrapod ancestor) but different functions (flight vs. swimming). Analogous structures have similar functions but different origins. Vestigial structures are remnants with reduced function. Homozygous is a genetic term.
• Third question: Sharing the same genetic sequence for a gene suggests a common ancestor. Mutations at different times would likely lead to sequence differences. It doesn't mean the sequence is the same in all species or non - functional.

Answer:

1. A. Fossil record
2. B. Homologous
3. C. Share a common ancestor