Chapter 6.2 Flashcards
External fertilization
Sperm and egg unite outside of the body of the parents
Mating
Gets the gametes to the same place at the same time
Internal fertilization
Sperm cells enter the body of the female to join with the egg cell inside
Pollen
Male gamete in plants (=sperm)
Ovules
In plants, contains the egg cells
Anther
Where pollen is made and stored
Filament
Stalk that supports the anther
Stigma
Sticky “lip” of the pistil that captures the pollen grains
Style
Stalk of the pistil which supports the stigma
Ovary
Base of the pistil containing ovules
Pistil
Female part of a plant which has three parts; stigma, style, ovary
Pollen tube
Structure formed to get the sperm in the pollen, which is stuck to the stigma, down the style to the egg cells in the ovary
Embryonic Development
Early development of an organism
Morula
Ball of cells formed by the dividing zygote
Blastula
Hollow ball of cells formed from the morula
Gastrula
Cells of the blastula organized into 3 layers; ectoderm, mesoderm, and endoderm
Ectoderm
Outside layer of the gastrula
MAKES: skin and nervous system
Mesoderm
Middle layer of gastrula
MAKES: kidneys, skeleton, muscles, blood vessels, and reproductive organs
Endoderm
inside layer of gastrula
MAKES: lungs, liver and lining of the digestive system
First trimester
0-15 weeks Brain and spinal chord are forming Digits appear ears, kidneys, lungs, liver, and muscles Sexual differentiation almost complete
Second trimester
16-25 weeks
Can feel baby moving
Eyelids open
Fetus can survive outside of the mother with specialized care
Third trimester
26-40 weeks
Rapid weight gain due to the growth and accumulation of fat
