Warmup January 21, 2014. Write the function of each organelle: n ucleolus endoplasmic reticulum r ibosomes Golgi complex cytoplasm. Warmup : January 22, 2014. What is homeostasis? The maintenance of a constant internal body temperature 2. How is the human body organized?
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Write the function of each organelle:
The maintenance of a constant internal body temperature
2. How is the human body organized?
Nervous, epithelial, muscle, connective
Nervous- controls stomach muscle movement (sends electrical signals through the body)
Epithelial-lines the stomach (covers and protects other tissues)
Muscle- mixes food and stomach acids (made of cells that contract and relax to produce movement)
Connective-blood is an example (joins, insulates, nourishes, and keeps organs from falling apart)
What are the six characteristics of living things?
Characteristics of living things
Exceptions to Mendel’s Principal’s:
If I flip a coin, what are the chances of it landing on heads?
Suppose I flip the coin once, get heads, and flip it again. What are the chances I will get heads again?
RESULT: two identical copies of the original cell—each contains four chromosomes
1. During interphase, chromosomes are copied.
2. Mitosis begins with prophase. The
3. During metaphase, the nuclear membrane
dissolves. The chromosomes align.
4. During anaphase, the chromatids separate
and move to opposite sides of the cell.
5. During telophase, the nuclear membrane
forms. The chromosomes lengthen, and
6. During cytokinesis, the cytoplasm divides
RESULT: FOUR CELLS, EACH CONTAINING TWO CHROMOSOMES (1/2 the amount of the adult)
Before meiosis begins, each chromosome is making an exact copy of itself, forming two halves called chromatids. The chromosomes then thicken and shorten into a form that is visible under a microscope. The nuclear membrane disappears.
Each chromosome is now made up of two identical chromatids. Similar chromosomes pair with one another, and the paired homologous chromosomes line up at the equator.
The chromosomes separate from their homologous partners and then move to opposite ends of the cell.
The nuclear membrane reforms and the cell divides. The paired chromatids are still joined.
Each cell contains one member of each homologous chromosome pair. The chromosomes are not copied again between the two cell divisions.
So, do these genetic disorders come from the male or female?
Take 10 minutes to look up these diseases. Write down: what it is and what issues the fetus might have
nucleotide-a subunit of DNA consisting of a sugar, phosphate, and base.
Description of DNA (double helix)
-sides of ladder are sugar and alternating phosphates
-rungs of ladder are bases
-adenine with thymine
-guanine with cytosine
Base pairs ALWAYS bond to each other’s bases….
CGAC will bond to GCTG