HEREDITY AND REPRODUCTION
QUESTION!!
• How would life be different if humans could reproduce with out a mate?
ASEXUAL OR SEXUAL?
ASEXUAL OR SEXUAL?
ASEXUAL OR SEXUAL?
ASEXUAL OR SEXUAL?
ASEXUAL OR SEXUAL?
ASEXUAL OR SEXUAL?
REPRODUCTION
• The transfer of genetic information from one generation to the next.• Every organism comes from a long line of
ancestors who reproduced successfully every generation.
ASEXUAL REPRODUCTION
• Only 1 parent. • Offspring is an exact copy of the parent.• Single celled organisms and bacteria.• Sometimes plants.
EXAMPLES OF ASEXUAL REPRODUCTION
• Binary Fission• Budding• Spores• Vegetative Reproduction• Fragmentation (starfish) • Parthenogenesis (whiptail lizard)
ADVANTAGES OF ASEXUAL REPRODUCTION
• Much faster, fast population increase. • Genetic continuity (offspring are identical to
parents). • Limits the spread of negative traits (only
organisms with those bad traits will pass them down).
DISADVANTAGES OF ASEXUAL REPRODUCTION
• If the environment changes, there are no variations, so the whole population may become extinct. • If a bad trait occurs, all offspring will get that
trait.
SEXUAL REPRODUCTION
• Two parents. • Half the genes come from the mother while the other half
come from the father.• Offspring genetically different.
• Special cells called gametes join together in a process known as fertilization.• The sperm and egg cells combine to form one
cell. • The new cell (zygote) is the first cell of the new
organism and continues to multiply itself until the organism is fully grown.
ADVANTAGES OF SEXUAL REPRODUCTION
• Variations in species-new combinations of traits increase organisms chances for survival. • If an environment changes, the entire population
will not become extinct (those with good traits will survive)• Adaptations
DISADVANTAGES OF SEXUAL REPRODUCTION
• Takes time. • Bad traits can be easily passed along.
Top Related