Radiolab- Why so many sperm? Matthew Cobb takes us back to 1677, when Anton Van Leewenhoek first identified sperm and there was much talk of souls and miniature men residing in the seminal fluid. Upon observation it became clear that there were an awful lot of those little guys that never turned into babies! Jad wonders: why so many sperm? Bird-sex specialist Tim Birkhead, of the University of Sheffield, explains what effect imperfect monogamy has on reproductive strategies. Then sperm physiologistJoanna Ellington and her pig Hazel give us some insight into the obstacles sperm must overcome in their odyssey from their male originator to their female destination.
Chapter 12: Reproductive strategies for survival
Page
Title
Summary/Main concepts
374-376
Sex at sea
Med-
377
A range of reproductive strategies
Long- learn all of this!!!
377-381
Mating systems
Med-long
-different systems
- how do they in reproductive success?
381- 383
Offspring: How many? How often?
Med-long
- Different strategies
- Hoe do they lead to reproductive success?
383-387
Eggs or liveborn young?
Med-
-what are the strategies?
-how do they lead to reproductive success?
388-390
Parental care or not
Med-
- What are the strategies?
- How do they lead to reproductive success?
391-393
Reproductive strategies: Australian marsupials
Med-
Apply what you have read so far here
393-395
How often do matings occur?
Patterns and times of breeding
Med-
How do other reproductive strategies apply here?
395-400
Plant reproduction
Med-
- What strategies are used?
- How is reproductive success increased?
- Which are R/K selected?
Radiolab- Why so many sperm?
Matthew Cobb takes us back to 1677, when Anton Van Leewenhoek first identified sperm and there was much talk of souls and miniature men residing in the seminal fluid. Upon observation it became clear that there were an awful lot of those little guys that never turned into babies! Jad wonders: why so many sperm? Bird-sex specialist Tim Birkhead, of the University of Sheffield, explains what effect imperfect monogamy has on reproductive strategies. Then sperm physiologistJoanna Ellington and her pig Hazel give us some insight into the obstacles sperm must overcome in their odyssey from their male originator to their female destination.
Chapter 12: Reproductive strategies for survival
-different systems
- how do they in reproductive success?
- Different strategies
- Hoe do they lead to reproductive success?
-what are the strategies?
-how do they lead to reproductive success?
- What are the strategies?
- How do they lead to reproductive success?
Apply what you have read so far here
Patterns and times of breeding
How do other reproductive strategies apply here?
- What strategies are used?
- How is reproductive success increased?
- Which are R/K selected?
Glossary:
Broadcast spawning
Zooplankton
Asexual
Sexual
Hermaphrodite
Parthenogenesis
External/ internal fertilisation
Monogamy
Polygamy
Polyandry
Promiscuity
r-selection
K-selection
Oviparity
Viviparity
Parental investment
Extra pair copulation
Lekking
Fecundity
Sperm competition
Mate guarding
Copulation
Amniote eggs
Placenta
Plancental mammal
Marsupial
Oestrous cycle
Pollination
Vectors
Dispersal