Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Need help with a more discriptive understanding of the reproduction of the pine cycle! Thank you!

Transcribed Image Text:Pollen grains
disperse via wind
MITOSIS
MEIOSIS
POLLINATION
Haploid (n)
|Diploid (2n)
Microspore (n)
forms pollen grain
Pollen grain
(male gametophyte)
Cones with
microsporangia
Four meiotic
products; one is
large and forms
the megaspore (n)
Megasporangium
Mother
cell (2n)
Three meiotic
| products die
MEIOSIS
Pollen grain
Ovules (contain
megasporangia)
Ovulate cone
Female
gametophyte (n) -
Egg (n) -
| Megaspore divides to
form female gametophyte (n),
which forms eggs by mitosis.
(Only one egg is fertilized
| and develops.)
Embryo
(2n)
Pollen tube
FERTILIZATION
MITOSIS
Pollen tube
Mature
Developing
sporophyte
delivers sperm
to egg
sporophyte (2n)
Seeds (disperse
via wind or animals)
Heterospory in Gymnosperms: Microspores Produce Pollen Grains; Megaspores Produce Female Gametophytes.
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