Biology Lifepac 8: Sexual Reproduction
organ
A group of tissues with a specific function in a part of the body.
tissue
A group or mass of cells having a common function.
incomplete metamorphosis
A kind of metamorphosis in which the change form larva to adult happens in a series of stages. the change is not as dramatic as the complete metamorphosis.
egg
A large gamete with food stored.
haplontic
A life cycle in which meiosis occurs shortly after fertilization, and most of the life cycle is passed as a haploid.
internal fertilization
A matting pattern in which the male and female come close together and the male introduces the sperm into the body of the female when fertilization occurs.
differentiation
A process changing cells or organisms from a generalized to more specific or specialized condition. It often involves a reduction of the ability to reproduce or divide, and it is usually not reversible.
cone
A reproductive organ of gymnosperms having a central axis with radiate scales and bracts. A cone can either produce pollen or ovules.
sperm
A small flagellated male gamete that swims to the egg to fertilize it.
diplontic
A type of life cycle in which meiosis produces gametes and the bulk of the life cycle is passed as a diploid. Adults are diploid.
external fertilization
A type of mating pattern in which eggs and sperm are released into the water after the mating partner come near one another. Fertilization occurs outside the body of the female.
complete metamorphosis
A type of metamorphosis in which the change from larva to adult occurs in one dramatic step. The larva and adult do not appear to be the same.
tadpole
A young frog or toad in the larval stage of development.
embryo
An early stage in the development of an animal or plant.
conjugation
An of fertilization involving the transfer of cells contents to another cell. Conjugation usually occurs in simpler organisms.
antheridium
An organ in simpler plants that produces sperm cells.
gametangium
An organ of lower pants that produces gametes.
gymnosperm
Cone-bearing plants. Often called evergreens.
gonad
Gamete producing organs in animals.
isogamete
Gametes that are the same size and shape.
oogamous
Having gametes of different size and shape. These organisms usually have eggs and sperm.
immotile
Incapable of independent movement.
flagellum
Long, whip like structure extending from a cell used for locomotion.
adult
Refers to grown or mature animals and plants.
aquatic
Something that live in or pertains to water.
terrestrial
Something which occurs on the land or refers to the land.
yolk
Stored food materials in the eggs of many animals.
oogamy
The condition of being oogamous.
anisogamy
The condition of having anisogametes.
anisogamete
The condition of having gametes similar in shape, but different in size.
isogamy
The condition of having isogamy.
pupa
The development stage between larva and adult in insects undergoing complete metamorphosis.
ovum
The egg cell; the female gamete.
ovary
The female gonad in animals. It produces eggs. Also, in plants is the lower part of the pistil that contains ovules and develops into fruit.
juvenile
The first or earliest period of life in a young animal.
life cycle
The idea that organisms reproduce form adult, to gametes, and back to adult again in a cycle or cyclical pattern.
larva
The juvenile stage or phase of life in a young animal or organism which undergoes metamorphosis.
testis
The male gonad in animals. It produces sperm.
stamen
The male organ of plants. It produces pollen.
anther
The part of the stamen of a flower that bears the pollen.
zygote
The result of fertilization in which two gametes have fused together. Often simply called a fertilized egg.
environment
The surroundings of an organism.
metamorphosis
The transformation of larva to adult. It occurs only in animals having great differences between larva and adult.
