Meiosis

Sex CellsGametes (germ cells)Eggs and Sperm

Somatic CellsAll other cells

Types of Human Cells

Questions: 1, 2, 3, 4

Autosomes – same number in males and females

Sex Chromosomes – X or Y

Human females: XX

Male females: XYTestosterone and

other hormones from the Y make a male

Types of Chromosomes

Question: 5

46 chromosomes in a somatic cell (23 pairs)

23 chromosomes in a gamete

Humans

Questions: 6, 7

Describes how many sets of different chromosomes a cell has.

n = number of chromosomes in 1 set (haploid number)

Haploid Cells: 1nDiploid Cells: 2nIn humans, n = 23 (the

number of different chromosomes we have)

Ploidy

32/16

62

Questions: the chart, 8, 9

Down Syndrome

Questions: 10, 11

Klinefelter’s Syndrome

Questions: 12, 13

Cause: NondisjunctionQuestion: 14