Reproduction/Development Flashcards
List three types of asexual reproduction.
Binary fission
budding
spore formation.
What is binary fission?
The nucleus of a fully grown cell divides and the cell splits into two equal-sized daughter cells.
Eg amoeba and bacteria.
What is budding?
Fully gorwn cell or organism forms a small cell or outgrowth (bud) that splits from the parent and develops into a separate organism. Eg yeast.
What is spore formation?
Tiny cells (spores) from in spore cases. They are scattered around when the case bursts. Each spore becomes a new organism.
What is regeneration?
The ability of some organisms to grow back missing body parts. eg. starfish, lobster.
What is fertilisation?
The method of reproduction in animals and plants. the two uniting gamets are different in size shape and activity.
What are gamates?
A sex cell; it joins with another gamete to form a single cell called a zygote, eg, sperm and eff shown at fertilisation.
What are the four basic parts of a flower?
Petal
sepal
stamen
carpel.
Contrast stamen and pistil (carpel)
Reproductive organs of the flower. The stamen contains pollen and the pistil contains the ovules.
What is fruit?
Matured ovary that contains seeds.
Eg. tomatos, corn and apples.
What are zygotes?
The diploid cell that results from the union of a sperm and ovum (a fertilised egg)
What is cleavage?
A rapid series
What is cleavage?
A rapid series of cell divisions, without cell growth, in a fertilise egg, that evolves the zygote into a hollow ball of cells (blastula)
What is the blastula?
An early embroonic form consisting of a single layer of cells surrounded by a fluid-filled cavity called the blastocoel.
What is the gastrula?
An embroy at the stage following blastula. A cellular cup, it consists of three layers: endoderm, ectoderm and mesoderm.
What is the ectoderm?
The ectoderm is the outer cell layer of the gastrula; it develops into the skin and nervous system.
What is the endoderm?
The inner cell layer of the gastrula; it develops into the internal organs such as the digestive tract.
What is the mesoderm?
The middle cell layer of the gastrula; it develops into muscles, bone, blood etc.
What is the notochord?
Composed of mesoderm cells, it serves as the primitive support column for the embryo until it is replaced by the spinal column.
What is the archenteron?
The central cavity of the gastrula, which ultimately forms the digestive cavity.
What is parthenogenesis?
The ability for eggs to develop into organisms without being fertilised. Present in bees, ants and some lizards.
What does Ovoviviparous mean?
Refers to animals that retain the fertilised eggs in their body until they hatch. Present in guppies, mosquitofish and some reptiles.
What does Oviparous mean?
Refers to animals that lay eggs that develop outside of the mothers body. Present in fish, birds, reptiles and monotremems (platypus)
What are testes?
Male gonads; produce sperm and male sex hormones.
