Warm up
This presentation is the property of its rightful owner.
Sponsored Links
1 / 22

Warm UP PowerPoint PPT Presentation


  • 72 Views
  • Uploaded on
  • Presentation posted in: General

Warm UP. Illustrate how the chromosome number in a sexually reproducing organism with 8 chromosomes remains constant from one generation to the next by drawing a model of meiosis and showing the TOTAL number of chromosomes in each stage, the steps, and the products for male and female. Warm Up.

Download Presentation

Warm UP

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Warm up

Warm UP

  • Illustrate how the chromosome number in a sexually reproducing organism with 8 chromosomes remains constant from one generation to the next by drawing a model of meiosis and showing the TOTAL number of chromosomes in each stage, the steps, and the products for male and female.


Warm up1

Warm Up

  • Deoxyribonucleic acid, the material that contains the information that determines inherited characteristics

  • One of the four possible bases in a string of DNA—it pairs with adenine

  • A subunit of DNA that consists of a sugar, a phosphate, and a nitrogenous base

  • The complement to guanine


Warm up2

Warm Up

  • What letters represent the four bases?

  • Using X-ray diffraction, what did Rosalind Franklin show the shape of DNA to be?

  • Watson and Crick built a DNA model like a ……

  • The sides of the DNA “ladder” are made of…….

  • The “rungs” of the DNA ladder are…..


Pick up warm up

Pick Up Warm Up

  • On the back of your warm up, answer the following:

  • What are the phenotypes based on the genotypes:

    Ggbb ____________________

    ggBB ____________________

    ggbb ____________________

    GgBb ____________________


Warm up3

Warm Up

  • A male rabbit with the genotype GGbb is crossed with a female rabbit with the genotype ggBb.

  • Determine the phenotypes and proportions in the offspring.


Warm up4

Warm Up

  • How many out of 16 have grey fur and black eyes?

  • How many out of 16 have grey fur and red eyes?

  • How many out of 16 have white fur and black eyes?

  • How many out of 16 have white fur and red eyes?


Warm up

DNA


What is dna

What is DNA

  • Deoxyriboneucleic Acid:

    a genetic code (like a blueprint) for making new cell parts, new cells, or an entirely new organism.

  • DNA wraps around protein cores and forms chromosomes found in the nucleus of eukaryotic cells.


History of dna

History of DNA

  • 1952 – Rosalyn Franklin discovered that DNA is made up of 2 chains of molecules arranged in a spiral form.


History of dna1

History of DNA

Chargaff’s Rule:

-Adenine always equals amount of Thymine.

A = T

-Guanine always equals amount of Cytosine.

G = C


Chargraff s rule

Chargraff’s Rule


History of dna2

History of DNA

  • 1953 – James Watson and Francis Crick constructed the first model of DNA and win the Nobel Peace Prize.


Dna structure

DNA Structure

  • DNA is often called a “double helix” or “twisted ladder.”

  • The sides are made of phosphate and deoxyribose-sugar molecules.

  • The middle (rungs) are made of nitrogenous base pairs (adenine/thymine, guanine/cytosine).


Four nucleotides

Four Nucleotides

The Four:

Adenine

Thymine

Cytosine

Guanine

  • Nucleotide: combination of a phosphate molecule, deoxyribose-sugar molecule & a nitrogenous base.


Complementary bases

Complementary Bases

The complementary strand/sequence to

G-A-T-T-A-C-A would be…

Remember Chargaff’s Rule:


Dna replication

DNA Replication

  • Before any cell can make a copy of itself, all the DNA must be copied!

  • This is called DNA replication.


Dna replication1

DNA Replication

  • An enzyme opens the strands of DNA so that they become single stranded.

  • Complimentary nucleotides come fill in the missing strand.

  • Two DNA strands are formed.


Let s model dna

Let’s Model DNA

  • Have students stand in two lines that spiral like a DNA molecule. Each line should hold string.

  • Students should hold cards labeled A, T, C, or G to represent the nucleotide pairs.

  • Have the two lines move away from each other to model how the DNA molecule separates into two strands.

  • Have free standing students pair up with matching A, T, C, or G cards to show how the open strands replicate.

  • This one example of how models can be similar to yet different from the natural occurrences they represent.

    http://www.classzone.com/books/ml_science_share/vis_sim/chm05_pg141_protein/chm05_pg141_protein.html


Making proteins

Making Proteins

  • Groups of three nitrogenous bases are a code (codon) for making specific amino acids

  • Strings of amino acids form proteins

  • RNA (riboneucleic acid) makes a temporary DNA copy

Genes: sections of DNA on chromosomes that

control production of proteins for specific traits such as:

hair color, eye color, dimples, freckles….


Rna vs dna

RNA vs. DNA

Differences:

Similarities:

  • Are nucleic acids

  • Contain nitrogenous bases

  • Contain phosphate & sugar molecules

Deoxyribose Sugar


Types of rna

Types of RNA

  • messengerRNA or mRNA: comes from nucleus w/ genetic information for protein synthesis (mirror image of DNA strand).

  • transferRNA or tRNA: carries matching amino acids to ribosomes.

  • ribosomalRNA or rRNA: constitutes 50% of a ribosome, decodes mRNA for tRNA to pick-up matching amino acids.


  • Login