Lecture - Oct 12

Lecture - Oct 12 - Some Plants Monophyletic group that now...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Some Plants - Monophyletic group that now includes o Red algae o Green algae o Land plants - Based on o Molecular data o Presence of chloroplasts bounded by outer and inner membranes Red and Green Algae - Red and Green Algae o Chloroplasts containing chlorophyll (a) and (b) plus carotenoids o Reproduction involves both asexual and sexual reprudiction – varied Isogamous – two flagellate gametes identical in size Anisogamous – two flagellate gametes of different sizes Oogamous – nonmotile egg and flagellate male gamete Ulva - Alternates between haploid and diploid multicellular generations - Gametes are either isogamous: two flagellate gametes identical in size - Or anisogamous: two flagellate gametes of different sizes - Depending on the species Chlamydomonas - Unicellular haploid green alga, alternates between haploid and a reduced diploid generation - It has two mating types (+) and (-) and is an example of isogamous sexual reproduction. Spirogyra – conjugation in Spirogyra (green alga) - Between two haploid filaments - Conjugation tubes form - Contents of one cell pass into another - Cells form diplod zygote – undergoes meiosis to become haploid again Red Algae - Mostly multicellular seaweeds o Important in warm tropical ocean waters - Some red algae incorporate calcium carbonate in their cell walls -
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
- Phycobilins: phycocyanin (blue) and phycoerythrin (red) o Water-soluble proteinaceous pigments - Sources of vitamins, minerals, food colorings and thickenings - Cell walls contain cellulose Green algae - Wide diversity in size, structural complexity and reproduction - Botanist hypothesize that ancestral green algae gave rise to land plants - Aquatic and terrestrial; cells walls made of cellulose Kingdom Fungi (chapter 26) Fungi - Membrane-enclosed nuclei, mitochondria and other membranous organelles
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.
  • Fall '09
  • D'ARVILLE
  • green algae, new haploid thallus, multicellular haploid thallus, flagellate gametes, haploid thallus Zygomycete

{[ snackBarMessage ]}

Page1 / 6

Lecture - Oct 12 - Some Plants Monophyletic group that now...

This preview shows document pages 1 - 3. Sign up to view the full document.

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