15 animal reproduction

Asexual reproduction

mode of reproduction in which a new offspring is produced by a single parent. There is no
production of gametes, and no fusion of male and female gametes

Fission

After a period of growth, an organism splits into two separate organisms

Budding

results from the outgrowth of a part of a cell or body region

Fragmentation

a parent organism breaks into multiple fragments, each of which can develop into a genetically identical new individual

Sexual reproduction

involves the fusion of two sex cells called gametes (sperm and egg). The fusion of the sperm and the egg forms a zygote

Testis

Site of production and storage of male gametes (sperm) and testosterone

Ductus deferens

transports sperm to the ejaculatory duct

Seminal vesicles

Secrete fructose

Acrosome

Unique organelle that contains many acidic
enzymes. These enzymes help the sperm penetrate the egg’s coat

Ovary

Release oocytes (immature eggs) and secrete the hormones estrogen and progesterone

Oviduct (Fallopian tube)

Leads from the ovary to the uterus

Uterus

the hollow, pear-shaped organ where fertilized egg grows and develops

Ovarian Cycle

controlled by FSH and LH; Immature follicle consists of a primary oocyte and surrounding cells

Uterine Cycle

controlled by estrogen