Cell Reproduction Cell Reproduction Meiosis 4 5 diploid

Cell Reproduction

Cell Reproduction – Meiosis 4. 5 diploid somatic cells are _______, • Body cells or ____ 2 sets of which means they have ___ chromosomes. male • One set came from the _______ parent and the other came from the ____ female parent.

Diploid Cells • Since diploid cells have 2 sets of chromosomes , they 2 n are represented by _____. In humans, this number is ____. 46 • Somatic diploid cells reproduce to make ____ identical copies of 2 themselves in the process Humans called ____. mitosis Somatic cell reproduction

Haploid Cells • Cells with only 1 set of chromosomes are said to be ____. haploid • These cells are n represented by ____. • In humans, this 23 number is ____. • Only the sex cells gametes of a or ____ multicellular organism are haploid.

Meiosis (not mitosis) • The gametes of an M = mitosis for somatic body cells organism are M = meiosis for making gametes produced in a type of cell division called _____. meiosis • Meiosis occurs in the _____ of M phase the cell cycle.

Meiosis • During meiosis, a nucleus undergoes 2 rounds of ___ division. • A diploid cell 4 becomes ____, haploid daughter _______ cells.

Meiosis in Humans Meiosis occurs in the reproductive organs. Testes in males (sperm) Ovaries in females (egg/ovum) Diploid germ cell In testicle or ovary Haploid sperm or egg cells

Meiosis Animation • http: //highered. mheducation. com/sites/007 2495855/student_view 0/chapter 3/animatio n__how_meiosis_works. html

Comparing Mitosis & Meiosis Mitosis Meiosis Growth & Repair Formation of gametes Type of cells it occurs in Somatic Germ cell in testes Germ cell in ovary Chromosome number in parent cell 2 n (46) Number of times the DNA replicates 1 1 Number of nuclear/cellular divisions 1 2 Number of daughter cells produced 2 4 Chromosome number in daughter cells 2 n (46) n (23) Daughter cells identical or different from parent cell identical different never Prophase I Purpose of Process When synapsis and crossing over occurs

Memory Aid • mi. Tosis main. Tains the chromosome number (2 n 2 n) • mei. Osis l. Owers the chromosome number from two sets to one set (2 n n)