8. Reproduction

8. Reproduction - Biology107Fall07 ReproductionI&II

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Biology 107 – Fall ‘07 1 Reproduction ( Reading:  Chapter 46) OVERVIEW OF ANIMAL REPRODUCTION Two principle modes of reproduction are found in animals: o Asexual reproduction Mitosis (cell division) o Sexual reproduction Haploid  gametes (ovum + spermatozoan)   zygote Meiosis ASEXUAL REPRODUCTION Fission Parent divides into 2 babies (eg. Sea anemone) Budding Baby splits off parent (eg. Coral) Fragmentation Parent fragments into babies, babies, babies (eg. Sponges) o Regeneration eg. starfish REPRODUCTIVE CYCLES AND PATTERNS Most animals have reproductive cycles, often relating to changing seasons Animals employ various patterns of reproduction and may use either sexual or asexual reproduction  exclusively, or alternate between the two o Parthenogenesis Daphnia – female produces eggs – for fertilization in unfavorable environmental conditions In favorable environmental conditions; eggs develop   haploid adults o Hermaphroditism Individuals have both male and female reproductive systems; may fertilize others or self; advantage: everyone  is a potential mate SEXUAL REPRODUCTION Mechanisms of fertilization – both depend on mechanisms ensuring mature sperm encounter fertile  eggs of same species o External fertilization Eggs and sperm are both released into the environment (water) Lots of offspring o Internal fertilization Organs designed to deliver sperm directly to where the eggs are located Fewer offspring, more parental investment (care, protection, feeding) Species with internal fertilization usually produce fewer zygotes and have higher parental investment REPRODUCTIVE SYSTEMS IN VERTEBRATES The reproductive systems in vertebrates are all similar, but some important differences are found: Birds, reptiles
Background image of page 1

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

View Full DocumentRight Arrow Icon
Biology 107 – Fall ‘07 2 o Cloaca Common opening to outside Reproduction Excretion digestion There are a number of differences among various species of mammals with respect to female  reproductive patterns Reproductive biology of the human male is similar to that of most animals, with some notable 
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/16/2011 for the course BIOL 107 taught by Professor Abbot during the Spring '08 term at UConn.

Page1 / 5

8. Reproduction - Biology107Fall07 ReproductionI&II

This preview shows document pages 1 - 3. Sign up to view the full document.

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