SECTION 6.2
in the last few lessons, we went over all the vocabulary of section 6.2 in the textbook. You ought to know this vocab for our next test/quiz. I did a HOMEWORK CHECK of
1.VOCAB WORDS COMPLETED
2. LAB DRAWINGS COMPLETED AND LABELED
2. ALL QUESTIONS FINISHED PAGE 223
For a lab, we observed and made drawings of:
a flower and its reproductive parts
A blastula and gastrula
a preprepared slide from "northwest" laboratories of human sperm
EVOLUTION OF SEXUAL REPRODUCTION
We also went outside to observe the morphology of plants and their parts for sexual reproduction. Plants engage in external fertilization. And, early in evolutionary history, plants required water for sexual reproduction. In particular, we observed that the evolution of plants on land occurred in this order:
marine protozoa which photosynthesize (algae) - use egg and sperm as gametes
mosses and other bryophytes - egg and sperm
Ferns - egg and sperm
Horsetails - egg and sperm
Gymnosperms (ex. conifers) - wind pollination
Angiosperms (ex. flowering plants) -wind pollination and vector pollination
Examples include the stellar magnolia (Magnolia stellata) which is one of the first ever vector pollinators
We reflected that animal evolution took a different pathway: animals chose to keep the swimming male gamete, the sperm, and thus, internal fertilization is the usual case for terrestrial animals. Internal fertilization requires the organisms to meet in space and time. Thus, animals are characterized by courtship behaviours
