Sexual and Asexual reproduction

# of Parents Sexual Asexual Two parents give DNA to offspring One parent gives DNA to offspring

Genetic Variation Sexual Asexual Offspring is genetically unique from parents Offspring is identical to (a clone) its parent

Mechanism Sexual Asexual Involves egg and sperm (gametes) which combine (fertilization) no egg AND sperm involved

Parental care Sexual Asexual parents usually care for their offspring usually no parental care

EXAMPLES: Asexual BUDDING – a bud grows off a parent hydra sponge yeast

EXAMPLES: Asexual FISSION – splits in two equal parts bacteria amoeba euglena

EXAMPLES: Asexual FRAGMENTATION – parent breaks into pieces which form new individuals blackworms coral

EXAMPLES: Asexual REGENERATION – an organism can grow a replacement body part starfish planarian

EXAMPLES:Asexual SPORE – asexual reproductive cell fungi ferns

EXAMPLES: Asexual VEGETATIVE PROPAGATION – ability of plants to produce new plants from part of the original plant - spider plants, aspen trees, strawberries

EXAMPLES: Sexual FERTILIZATION – mixing of male and female genes protists plants animals

pollination/fertilization

ADVANTAGES: Sexual have a mate (to help with offspring, etc.) can choose the “best” traits in mate increased variation/variety less likely for bad genes/traits to be passed on good for CHANGING environments

ADVANTAGES: Asexual don’t have to find a mate (good if you can’t or don’t move) get more offspring faster doesn’t take much energy all of the genes are passed on good in STABLE environments

Which produces more offspring faster?

DISADVANTAGES: Sexual may not choose the best mate Only 50% of genes passed on takes more energy less offspring takes longer

DISADVANTAGES: Asexual no variety – every one is the same fight for food and space all bad genes/traits are passed on not good for changing environments

Credits http://i.ehow.co.uk/images/a05/r9/uv/growth-baby-birds-1.1-800X800.jpg http://t3.gstatic.com/images?q=tbn:ANd9GcS9gj6pj7ECq0iE-P2fjwGeITaYbH3SiszHym0jLTVEh9jgi1OkJg http://1.bp.blogspot.com/-H-vlYtg_enc/TWMAAtQGkjI/AAAAAAAAAEY/7dgZmM8Y92g/s1600/Puzzled_Man.jpg http://www.drawingcoach.com/image-files/cartoon_girl_st5.gif http://www.sciencephoto.com/images/showFullWatermarked.html/B307155-Gloeocapsa_blue-green_alga-SPL.jpg?id=663070155 http://www.nurseryassociates.com/gallery/images/SpiderPlant10.jpg http://www4.ncsu.edu/unity/lockers/users/f/felder/public/kenny/images/family/2007_family.jpg