Thursday, November 5, 2015

Chapter 6

Chapter 6



Section1: Chromosomes & Meiosis





Your body produces 2 types of cells....

1. Germ Cells aka Sex Cells aka Gametes



2. Somatic Cells aka body cells (all other cells in your body)



The number of chromosomes varies within species....

Humans have 23 pairs of chromosomes in each cell (46 chromosomes total)

Fruit flies have 4 pairs of chromosomes in each cell (8 chromosomes total)
Dogs have 39 pairs in each cell
Cats have 19 pairs...


No matter what species you have each chromosome has its pair (the same size and copies of the same genes)

These two pairs of chromosomes are called HOMOLOGOUS CHROMOSOMES



The EXCEPTIONS are the Sex Chromosomes... 

Fertilization happens when an egg (having 23 chromosomes, Haploid cell) combines with the sperm (having 23 chromosomes, Haploid cell) forming a DIPLOID CELL



Haploid Vs Diploid




Syndromes of Sex Linked Chromosomes

Turner Syndrome

                               






Klinefelter Syndrome

Extra Y Chromosome



Some More Info

What about Down Syndrome

 Are Men Going Extinct?



Mitosis vs Meiosis
DIFFERENCES: Meiosis has 2 Divisions & The Result are 2 GENETICALLY DIFFERENT HAPLOID cells
UNIQUE OCCURRENCE IN PROPHASE I
(CROSSOVER)

Review


No comments:

Post a Comment