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Presentations tomorrow

Presentations tomorrow. Dress nicely tomorrow Recommended to practice your comments/ ppt tonight with your parents/siblings to see what makes sense, how long it takes, etc. Each person will have literally 5 minutes. You have until Wednesday night 11:59pm to email me the ppt.

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Presentations tomorrow

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  1. Presentations tomorrow • Dress nicely tomorrow • Recommended to practice your comments/ppt tonight with your parents/siblings to see what makes sense, how long it takes, etc. • Each person will have literally 5 minutes. • You have until Wednesday night 11:59pm to email me the ppt.

  2. Schedule / switching off rooms. • 1:30 – 1:35: Seth - Rm. 243 • 1:35-1:40: Netanel - Rm. 244 • 1:40 – 1:45: Joey S – Rm. 243 • 1:45 – 1:50: Yosef C - Rm. 244 • 1:50 – 1:55: Aryeh - Rm. 243 • 1:55 – 2:00: David - Rm. 244 • 2:00 – 2:05: Gilad - Rm. 243 • 2:05 – 2:10: Jeremy - Rm. 244 • 2:10 – 2:15: Jonah - Rm. 243 • 2:15 – 2:20: Ben - Rm. 244 • 2:20 – 2:25: Max - Rm. 243 • 2:25 – 2:30: Joey - Rm. 244 • 2:30 – 2:35: Jordan - Rm. 243 • 2:35 – 2:40: Asael - Rm. 244

  3. Dihybrid cross work problems • Review problems

  4. Complications with Mendelian Genetics • Incomplete dominance • Codominance • Multiple alleles • Multiple-gene determination

  5. Incomplete dominance Example: • Incomplete dominance: This is when there are two different alleles but a heterozygous individual expresses something in the middle between the two homozygous alternatives.

  6. Codominance • Codominanceis when there are two alleles but the heterozygous individual expresses BOTH of the homozygous alternatives. Heterozygous plant expresses BOTH red and white- not something in the middle.

  7. Multiple alleles • There are some cases in which there are not just two options for what the gene can be. • Example: Imagine a flower that had options of B (blue), R (red), G (green) and W (white). • There are all sorts of possibilities. Some of the alleles might be normal dominance. Others might be incomplete or codominance.

  8. Multiple-Gene Determination • Single-gene determination is when a single location on a single chromosome decides what the phenotype is. • Multiple-gene inheritance is when a phenotype is determined by the net total of many different genes on many different chromosomes. • Imagine height- there might a single gene that determines how long a single bone is. Then your height is made up of many bones, muscles, etc.

  9. Matching • Multiple alleles • Multiple-gene determination • Many different genes contribute to the phenotype • For a single gene there are more options than just 2 alleles.

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