all partner pairs should have: 1) dark blue a. all dark blue b. cross-over 2) light blue a. all...
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All partner pairs should have:1) Dark Blue
A. All dark blueB. Cross-Over
2) Light BlueA. All light blueB. Cross-Over
3) Dark GreenA. All dark greenB. Cross-Over
4) Light GreenA. All light greenB. Cross-Over
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Definition
Alleles: Different forms of the same gene
Genotype: An organism’s genetic makeup
Phenotype: An organism’s appearance
Example
There are multiple alleles for hair type. There is one allele for straight hair and a different version of the same gene (a different allele) for curly hair.
A human might have one allele for straight hair and one allele for curly hair.
A human could have curly hair.
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1) With your partner create four gametes that might arise from independent assortmentA. Separate homologous chromosomes (meiosis I)B. Separate sister chromatids (meiosis II)
2) Choose one lucky gamete that will go on to create an offspringA. Write down the traits of this gamete, save these two
chromosomesB. Pile up the other three gametes on the side of you desk
3) Partner pairs will get into their assigned groups (2 partner pairs)A. Stay with your assigned partner, bring your chosen gameteB. Your teacher will help you get into your groups
4) Fuse the gametes in your group together.1) What is the genotype of your offspring?2) What is the phenotype of you offspring?3) Which allele came from each parent?
5) He
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Mendelian Genetics
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Mendelian Genetics
Named for Gregor Mendel, an Austrian from the 1800’sMendel is considered the “father of genetics”He bred plants for different traits and made scientific observations about his resultsFamous for breeding pea plants
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Seven traits were tested
Discoveries:
Two genes must be present for each trait (one from each gamete)
Some alleles “dominate” over other alleles
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•Alleles that show up in appearance are called dominant
•Alleles that are masked are called recessive
Dominant
Dominant
Recessive
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Make a chart listing which allele is dominant and which is recessive for each of the seven traits tested by Mendel. (pg 176)
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Trait Dominant Recessive
Page 176
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Homework
Survey of Tongue Rolling: A Family Tree
1) Ask questions Can you roll your tongue? Can your parents roll their tongues? Can your maternal grandparents roll their tongues? Can your paternal grandparents roll their tongues? Can your siblings roll their tongues?2) Complete the chart
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Tongue Rollers?1) Survey your group
A. # of tongue rollers B. # of non-tongue rollers
2) Send one person to write it on the board3) Write the ratio for the class
Ex. # R : # r4) Make a graph of the class5) Write a conclusion Ex. Which trait is dominant and which trait is recessive?
Tongue Rollers Non-Rollers05
10152025303540
Survey of Tongue Rolling