18.Multicellularity GAE

18.Multicellularity GAE - Thinking about mul3cellular...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Thinking about mul±cellular organisms Fig. 31.11A Learning objec±ves: 1) To understand how biologists fgure out li²e cycles; 2) To appreciate the advantages and the challenges o² evolving into large mul±cellular organisms; and 3) To understand the consequences o² size. Keep the worksheet as a study guide Major themes in eukaryotes so ²ar Pro±sts – endosymbiosis – process, evidence, bioenerge±cs, consequences general eukaryo±c ²eatures; major groups li²e cycle and origin o² sex eukaryo±c pathogens Di³usion – physical process, evolu±onary constraint Plants – li²e cycle phylogene±c tree – adapta±ons to land environment Fungi – growth ²orm and nutri±onal strategy root symbionts with early plants and agricultural crops ²ungal pathogens and human signifcance GAE Part 1. Modeling Life Cycles Previous GAE’s – constructed different models for biological energy flow, phylogeny, endosymbiosis, and diffusion Life cycle diagram – simple model of the major stages in the life of an organism. One approach – evolutionary reasoning explains why a life cycle has certain features. For example, the plant life cycle exhibits alternating haploid (1n) and diploid (2n) generations Why the haploid gametophyte (1n) stage?______________ Why the diploid sporophyte (2n) stage? ________________ Complementary approach – mechanistic reasoning focuses on the processes involved in the cycle. Generalized sexual life cycle in eukaryotes
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.
  • Spring '08
  • Multicellular organism, multicellular eukaryotes, plant life cycle, multicellular photosynthetic organisms

{[ snackBarMessage ]}

Page1 / 4

18.Multicellularity GAE - Thinking about mul3cellular...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online