Lecture 20, Ch. 46

Lecture 20, Ch. 46 - Lecture #20 Date _ x Chapter 46 ~...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture #20 Date ________ Chapter 46 ~ Animal Reproduction
Background image of page 1

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

View Full DocumentRight Arrow Icon
Overview Asexual (one parent) fission (parent separation) budding (corals) gemmules (porifera) regeneration (inverts) Sexual (fusion of haploid gametes) gametes (sex cells) zygote (fertilized egg) ovum (unfertilized egg) spermatozoon (male gamete)
Background image of page 2
Reproductive cycles Parthenogenesis unfertilized egg development; haploid, sterile adults (honeybees) Hermaphroditism both male & female reproductive systems; sessile & burrowing organisms (earthworms) Sequential hermaphroditism reversal of gender during lifetime •protogynous (female 1st) •protandrous (male 1st)
Background image of page 3

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

View Full DocumentRight Arrow Icon
Mechanisms of sexual reproduction Fertilization (union of sperm and egg) • external • internal Pheromones chemical signals that influence the behavior of others (mate attractants)
Background image of page 4
Mammalian reproduction, I The Human Male Testes ~ male gonads Seminiferous tubules ~ sperm formation
Background image of page 5

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

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 15

Lecture 20, Ch. 46 - Lecture #20 Date _ x Chapter 46 ~...

This preview shows document pages 1 - 6. Sign up to view the full document.

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