Unit 11 Test Flashcards
(26 cards)
Mitosis
Nuclear cell division
2 daughter cells
Complete set of chromosomes
Zygote
Diploid Cell formed when sperm fertilizes egg
Blastula
Hollow ball of cells in layer surrounding a fluid filled space
Embryo after cleavage but before gastrula
Gastrula
Embryo development stage where cells on one side of blastula move inward forming cavity of two or 3 layers with opening at one end
Ectoderm
Outer cells on gastrula
Skin and nervous tissue
Mesoderm
Middle Cell layer in gastrula
Between ectoderm and endoderm
Forms muscles, circulatory system, excretory system
Endoderm
Inner cell layer of gastrula
Develops into digestive system
Protosome
Animals with mouths that develop from opening in gastrula
Mouth—>Anus
Dueterostome
Animal where mouth comes from cells besides the gastrula
Anus—> mouth
Larva
In insects, free living worm like stage of metamorphosis
Caterpillar
Asymmetry
Not symmetrical
Bilateral symmetry
Body arranged left and right
Butterfly
Radial symmetry
Body arranged with central part
Pie
Anterior
Direction
Towards head
Posterior
Away from head
Dorsal
Towards the back
Ventral
Away from back
Acoelom
No body cavities
Pseudocoelom
Fluid filled body
Coelom
Fluid filled body cavity completely surrounded by mesoderm
Exoskeleton
Hard covering on outside of body
Support
Mollusks, spiders
Endoskeleton
Internal skeleton, support, internal organs, internal brace
Invertebrate
Animal without a backbone
Vertebrate
Animal with endoskeleton and backbone
