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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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warmup january 21 2014
Warmup January 21, 2014

Write the function of each organelle:

  • nucleolus
  • endoplasmic reticulum
  • ribosomes
  • Golgi complex
  • cytoplasm
warmup january 22 2014
Warmup: January 22, 2014
  • What is homeostasis?

The maintenance of a constant internal body temperature

2. How is the human body organized?

Cells-tissues-organ-organ system-organism

warmup january 23 2014
Warmup: January 23, 2014
  • What are the four types of tissue in the stomach?

Nervous, epithelial, muscle, connective

  • Define them.

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)

warmup january 24 2014
Warmup January 24, 2014

What are the six characteristics of living things?

Characteristics of living things

Metabolism DNA

Stimulus homeostasis

Reproduction cells

review on quiz thursday january 23rd
Review—on Quiz THURSDAY, JANUARY 23rd
  • heterozygous/homozygous
  • hybrid/purebred
  • allele-different forms of a gene
  • gene-instructions for an inherited trait—each have 2 alleles, both of these make up a genotype
  • trait
  • characteristic
  • incomplete dominance
  • genotype/phenotype
  • Be able to solve Punnett square problems
january 21 2014
January 21, 2014

Exceptions to Mendel’s Principal’s:

  • Incomplete dominance: one trait isn’t completely dominant over another. Each allele has an influence on the traits of the offspring
  • One gene, many traits: a gene that controls fur color may also control eye color
  • Many genes, one trait: different combinations of alleles can result in a variety such as: your skin, hair, and eye color can act together---in humans, a variety of heights can occur

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?

  • Explain the difference between mitosis and meiosis
  • Describe how chromosomes determine sex
  • Explain why sex-linked disorders occur in one sex more often than in the other
  • Interpret a pedigree
meiosis to make smaller vs mitosis threads
Meiosis (to make smaller) vs. Mitosis (“threads”)
  • asexual reproduction-mitosis—most single celled organisms and the cells inside your body
  • sexual reproduction-meiosis—two parents form offspring
  • sex cells-parent cells that form offspring
  • homologous chromosomes-chromosomes that carry the same set of genes
  • meiosis-a copying process that produces cells with half the usual number of chromosomes (chromosomes are copied once and nucleus divides twice)
mitosis revisisted
Mitosis Revisisted…

RESULT: two identical copies of the original cell—each contains four chromosomes


1. During interphase, chromosomes are copied.

2. Mitosis begins with prophase. The

chromosomes condense.

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

mitosis ends.

6. During cytokinesis, the cytoplasm divides


step 1
Step 1:

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.

step 2 prophase
Step 2: Prophase

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.

phase 3 metaphase
Phase 3: Metaphase

The chromosomes separate from their homologous partners and then move to opposite ends of the cell.

phase 4 anaphase
Phase 4: Anaphase

The nuclear membrane reforms and the cell divides. The paired chromatids are still joined.

phase 5 telephase
Phase 5: Telephase

Each cell contains one member of each homologous chromosome pair. The chromosomes are not copied again between the two cell divisions.

some sex linked disorders
Some Sex-linked Disorders:

Martin-Bell syndrome



Cystic fibrosis

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

  • Erwin Chargaff-biochemist-found amount of adenine in DNA always equals the amount of thymine and the amount of guanine always equals the amount of cytosine.
  • Rosalind Franklin-using x-ray diffraction, she was able to make images of DNA (showing the spiral shape)
  • James Watson and Francis Crick-explained how DNA was copied and built a model from their laboratory, DNA looked liked a twisted ladder
  • Describe the basic structure of a DNA molecule.
  • Explain how DNA molecules can be copied.

nucleotide-a subunit of DNA consisting of a sugar, phosphate, and base.

  • DNA-deoxyribonucleic acid
  • 4 bases of nucleotides: adenine, thymine, guanine, cytosine (A, T, G, C)

Description of DNA (double helix)

-sides of ladder are sugar and alternating phosphates

-rungs of ladder are bases

-adenine with thymine

-guanine with cytosine

to replicate
To replicate…

Base pairs ALWAYS bond to each other’s bases….


CGAC will bond to GCTG

dna is copied every time a cell divides half the dna molecules are old and half are new
*DNA is copied every time a cell divides*Half the DNA molecules are old, and half are new

G=grey fur

B=black eyes

g=white fur

b=red eyes

gene changes
Gene changes
  • Mutations-changes in the number, type, or order of bases on a piece of DNA
  • Substitution-a wrong base is used
  • Insertion-an extra base is added
  • Deletion-when a base is left out
  • Good: can help survive better in an environment
  • Bad: can cause color changes that might get a predator’s attention
  • Cells make proteins to fix mutations; although not all mutations can be fixed…
homework this week
Homework this week:
  • Chapter 5 Review: page 137 #1-23 Due Thursday
  • Genetics with a smile homework due Friday (E group)
  • Genetic engineering homework due Friday (S, M Groups)
  • Quiz Chapter 5 Thursday