Reproductive Strategies Asexual vs Sexual External vs Internal

Reproductive Strategies Asexual vs. Sexual External vs. Internal Fertilization Spores vs. Seeds in Plants Egg Types

Asexual vs. Sexual Reproduction Asexual Sexual More opportunities Less energy needed More offspring Less offspring No parental care Some parental care Lower offspring survival Higher offspring survival

Asexual Reproduction

Sexual Fertilization

External vs. Internal Fertilization (uniting of sperm and egg) External(outside) Internal(inside) Needs a water environment Doesn’t require a water environment Eggs are unprotected Eggs are protected (uterus or shell) Random/inaccurate fertilization Specific/accurate fertilization Large amounts of sperm/egg Small amounts of sperm/egg Typically aquatic animals (fish, amphibians) Typically land animals (reptiles, birds, mammals)

Spores vs. Seeds in Plants Spores Seeds Microscopic size Large and visible Simple single-celled structure Complex multi-celled structure Produced by leaves Produced by flowers/fruit Needs water to germinate Can germinate anywhere Spread by wind Spread by animals, wind, & water Produced in large amounts Produced in lesser amounts

Spores vs. Seeds in Plants

Spores

Types of Seeds

Egg types of Vertebrate Animals Fish & Amphibian Eggs -no shell -embryonic sac provides nutrients -needs water to survive Amniotic Egg -yolk sac provides nutrients -shell protects embryo -Reptiles(soft) & Birds(hard) - survives dry land

Egg types of Vertebrate Animals Placental Mammals -no shell -placenta provides nutrients -internal development