Science Notebook Layout DON’T COPY UNDERLINED TEXT Mrs. Aguirre’s Webpage: http://www.quia.com/profiles/caguirre 61 6 0 Growth and Reproduction in Cells P. 152: What is Cell Division? P. 153: Chromosomes? P. 154: Cell Cycle? Picture 2 main ideas in each box
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
2. A person cannot see a single cotton thread 100 feet away, but if you wound thousands of threads together into a rope, it would be visible. How does this statement relate to our DNA extraction?
3. In order to study our genes, scientists must extract the DNA from human tissue. Would you expect the method of DNA extraction we used for the wheat germ to be the same for human DNA? Why or why not?
4. If we were to take cells from your body and extract the DNA, what would your DNA look like?
5. Is DNA the same in any cell in the human body? Explain your answer.
Analysis and Conclusions1. Use a Punnet Square to predict the phenotypic ratios in this cross:
T T x T t
Short toe _____
Long toe _____
2. Would you expect the coin toss method to give a similar ratio as the punnett square above?
3. What do the pennies or chips represent in the simulation?
4. When you toss the coin to see which side lands up, you are actually simulating what part of the process of sexual reproduction?
5. When you put the two coins that are flipped together, you are simulating what part of the process of sexual reproduction?
8382
Conclusion paragraph:
In the penny genetics lab….
Male or Female?Sex chromosomes carry genes that determine whether an individual is female or male.
Female = XX
Male = XY
Sex-linked Traitsare carried on the X or Y chromosome.
Sex-linked genes can have dominant and recessive alleles.
Males are more likely to have a sex-linked trait that is controlled by a recessive allele.
Females are often carriers – they can have the allele but not show the trait.
Incomplete Dominanceis when one allele isn’t completely dominant over the other.
Cross a purebred, red-flowered snapdragon with a purebred, white white -flowered snapdragon and you end up with pink snapdragons!
Co-Dominance
In codominance, an organism has two different alleles of a gene and shows both phenotypes at the same time.
Multiple Alleles
Multiple alleles are also common in organisms.
In humans for example, three alleles determine blood type (A, B, and O).
Polygenic Traits
Polygenic traits are determined by more than one gene.Feather color in parakeets is determined by two genes. One gene controls yellow color and the other controls blue color.