Sex-Linked Traits

Videos from today

Heredity Lab I

Objective: Determine the likely Phenotype of a theoretical mix between two canines.
Purpose: Demonstrate an understanding of Punnett Squares and Hybridization
Equipment: 4 sided die

Lab Questions

• For each of your genotypes in the original dog you drew, label “heterozygous” or “homozygous”.
• What did you notice about the chances of inheriting the dominant trait when both parents were homozygous and one parent had the recessive trait?
• How did we model the Law of Independent Assortment? Explain.
• How did we model the Law of Segregation? Explain.
• If you were a dog breeder and wanted to ENSURE that your puppy had long legs, droopy ears, and a long body, what PHENOTYPES would you select in the parents?
• Can you be 100% positive that you will get your desired puppy phenotype? Why or why not?
• The Law of Independent Assortment says that genes are inherited independently (alone). But, what if the gene for fluffy fur and the gene for long legs were on the SAME chromosome? How might that impact what allele is inherited? Explain.

Here is a link to the presentation on basic Heredity

Monohybrid Practice Problems

Punnett Squares

another example

Questions from the Video"

1.What is an allele?

2.Explain the relationship between “dominant” and “recessive” traits

3.Define Heterozygous and Homozygous

4.What is meant by genotype and phenotype?

Meiosis Pop-Bead Questions

Here are the questions from this week's investigation

• What is the end result of meiosis?
• Is an unfertilized egg haploid, diploid, or tetraploid? What about a sperm cell? What about a fertilized egg?
• How many different sources of DNA (different colors) does your fertilized egg have?
• Let’s assume that each popbead is a gene. Look at your fertilized egg. How many genes came from the: paternal grandfather (blue), paternal grandmother (red), maternal grandfather (green), and maternal grandmother (yellow)? Are these numbers the same for other groups?
• A friend asks you, “Me and my sister have the same two parents. If we both got our DNA from the same two people, why don’t we look like twins?” What would you say to your friend?
• Look at the genes for baldness in your fertilized egg. Did it originate from the paternal grandfather (blue), paternal grandmother (red), maternal grandfather (green), or maternal grandmother (yellow)? (Hint there should be two answers)
• Billy is a growing fetus. Billy's parents want Billy the fetus to have the maternal grandmother's beautiful freckles, however the maternal grandfather, paternal grandparents, and the parents do not have freckles. Is it likely that Billy the fetus will inherit the maternal grandmother’s gene for freckles? Why or why not?
• Everyone's embryo at the end of the activity is different. What three steps did we do in this activity that contributed (played a part) in this variation (differences) for each embryo?

Enrichment Questions for Friday

• Describe the similarities and differences between Mitosis and Meiosis (use your science vocab).
• Write a ClEvR statement to support or refute the following statement:  "Meiosis is not a cycle."
• Where does the variability in Genes come from in Meiosis? (identify three sources)

Skin Color Interactive Activity

Open your packet and answer the anticipatory questions.

Go to this link and click launch interactive. There should be a video playing. If you didn't bring headphones, you can either play it quietly at your desk or turn on closed captions.

Once you've finished watching the video through, replay it and stop at the first white line.

Go to contents and click on the first link (What is skin). Answer the questions in the packet under the heading "First stop point: What is Skin?"

Resume the video until you get to the next stop point. Repeat the process until you have finished all the questions in your packet.

Ask Mr. Sultzer if you have any questions.

Trancription/Translation and Epigenetics Notes

Here are some of the power points I've been using over the last week, if you would like to use them to take notes.

Transcription/Translation

Epigenetics