3. Animals are motile Heterotrophy often requires motility to capture prey. Animals have motility during at least some part of their life cycle
3. Animals are motile Heterotrophy often requires motility to capture prey. Animals have motility during at least some part of their life cycle
4. Animals are diploid The dominant generation in the life cycle is the diploid generation. Their gametes are heterogametes different sizes) eggs are larger than sperm. Gametes are produced by meiosis a typical animal life cycle: adult fertilization meiosIs sperm, eggs
4. Animals are diploid • The dominant generation in the life cycle is the diploid generation. • Their gametes are heterogametes (different sizes); eggs are larger than sperm. • Gametes are produced by meiosis. • A typical animal life cycle:
Human Life Cycle mitosis, differentiation and growth juvenile(2n) mitosis adults(2n) differentiation and growth zygote(2n) meiosis meiosis sperm fusion to form zygote haploid stages egg(n) diploid stages
Human Life Cycle
Cyclica/ parthenogenesis Hybridization sexual hatching parthenogenetic c/e formation son pictures by ebert 2005
pictures by Ebert 2005 Cyclical parthenogenesis Hybridization
5. Animals have a period of embryonic development During embryonic development, cells become specialized and form two or three layers of tissues
5. Animals have a period of embryonic development During embryonic development, cells become specialized and form two or three layers of tissues