Back to basics
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Transcript of Back to basics
Back toBasics
Enough fooling around. We get serious today. It’s time for GENETICS
GENETICS - The study of how TRAITS are passed from PARENTS to OFFSPRING
• Offspring usually show at least SOME traits of the parents
• EVERYTHING we do in this chapter happens in CELLS.
• Body Cell (somatic) • Sex CEll (gamete)
• Makes up tissues and organs • Makes Sperm or Egg
• Chromosomes in PAIRS • Chromosomes in SINGLES
• The number of chromosomes in a cell really matters because ALL living things have a very specific CHROMOSOME NUMBER.
For example . . .
• But that’s just us. Different species have different CHROMOSOME NUMBERS. Turn the page and see if you can match the animal to the number of chromosomes in its body cells . . .
26
38
78
36
48
34
Fascinating but does anyone know which animal has the MOST chromosomes in its cells?
254
How about the animal with the LEAST chromosomes in its cells?
2
But remember ALL living things have CELLS and ALL cells have CHROMOSOMES
768
4
• No matter which organism you are looking at, All of their chromosomes have GENES
GENE - A specific section of a chromosome that DETERMINES a specific trait
SEX CELL (gamete)
BODY CELL (somatic)
Now let’s build on this Chromosomes having Genes stuff . . .
Mom’s Egg Dad’s Sperm
• The sperm will fertilize the egg, and you will create a ZYGOTE
But what will this child look like?
To Be Continued . . .