Ch. 11.4 Many plants reproduce with flowers and fruit.

Vocabulary: angiosperm, flower, fruit

Review:
1. Ovary of flower becomes fruit.
2. Some animals feed on nectar, carrying pollen from flower to flower. Others eat fruit and disperse seeds as waste.
3. Sample answers: oxygen, food, material, coal and gas, wood, paper, fabric, medecine
4. flowering plants because insects feed on nectar and fruit
5. Upper part of pistil becomes stem, fertilized eggs become seeds, ovary becomes fruit.

Ch. 20.3 The reproductive system allows the production of offspring..

Vocabulary: menstruation, fertilization, embryo, fetus

Review:
1. male: makes sperm cells; female: makes egg cells; nourishes offspring until birth
2. Hormone stimulates eggs in ovary to develop. Hormone signals egg to move through fallopian tube to uterus.
3. Embryo is ball of cells; fetus has beginnings of features, organs, and skeleton.
4. Fertilized egg moves down fallopian tube; it divides and continues as a ball of cells; forms an embryo; embryo implants in uterus.
5. signal cells in testes to develop into sperm; signal ovaries to release eggs
6. Hormones from endocrine system signal sexual development. In females, hormones make egg develop and make ovary release it.

Ch. 4.3 Meiosis is a special form of cell division.

Vocabulary: gamete, egg, sperm, fertilization, meiosis.

Review:
1. A gamete (haploid)
2. A sperm and an egg combine to form a new cell.
3. Meiosis produces 4 1n gametes instead of 2 2n cells. It involves 2 divisions after DNA is copied, rather than 1 division after DNA is copied.
4. ProphaseI: one cell contains twice usual number of chromosomes for species; prophase II; two cells each with two copies of one homolog of each chromosome pair.
5. Meiosis: produces 4 1n cells, 2 divisions; mitosis: produces 2 2n cells, one division; both: DNA copied, chromosomes divide, new cells form.
6. One cell divides twice, so one cell produces four. The cells are 1n because DNA was only copied only once.