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 blue B. Cross-Over 2) Light Blue A. All light blue B. Cross-Over 3) Dark Green A. All dark green B. Cross-Over 4) Light Green A. All light green B. Cross-Over

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Page 1: All partner pairs should have: 1) Dark Blue A. All dark blue B. Cross-Over 2) Light Blue A. All light blue B. Cross-Over 3) Dark Green A. All dark green

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

Page 2: All partner pairs should have: 1) Dark Blue A. All dark blue B. Cross-Over 2) Light Blue A. All light blue B. Cross-Over 3) Dark Green A. All dark green

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.

Page 3: All partner pairs should have: 1) Dark Blue A. All dark blue B. Cross-Over 2) Light Blue A. All light blue B. Cross-Over 3) Dark Green A. All dark green

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

Page 4: All partner pairs should have: 1) Dark Blue A. All dark blue B. Cross-Over 2) Light Blue A. All light blue B. Cross-Over 3) Dark Green A. All dark green

Mendelian Genetics

Page 5: All partner pairs should have: 1) Dark Blue A. All dark blue B. Cross-Over 2) Light Blue A. All light blue B. Cross-Over 3) Dark Green A. All dark green

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

Page 6: All partner pairs should have: 1) Dark Blue A. All dark blue B. Cross-Over 2) Light Blue A. All light blue B. Cross-Over 3) Dark Green A. All dark green

Seven traits were tested

Discoveries:

Two genes must be present for each trait (one from each gamete)

Some alleles “dominate” over other alleles

Page 7: All partner pairs should have: 1) Dark Blue A. All dark blue B. Cross-Over 2) Light Blue A. All light blue B. Cross-Over 3) Dark Green A. All dark green

•Alleles that show up in appearance are called dominant

•Alleles that are masked are called recessive

Dominant

Dominant

Recessive

Page 8: All partner pairs should have: 1) Dark Blue A. All dark blue B. Cross-Over 2) Light Blue A. All light blue B. Cross-Over 3) Dark Green A. All dark green

Make a chart listing which allele is dominant and which is recessive for each of the seven traits tested by Mendel. (pg 176)

Page 9: All partner pairs should have: 1) Dark Blue A. All dark blue B. Cross-Over 2) Light Blue A. All light blue B. Cross-Over 3) Dark Green A. All dark green

Trait Dominant Recessive

Page 176

Page 10: All partner pairs should have: 1) Dark Blue A. All dark blue B. Cross-Over 2) Light Blue A. All light blue B. Cross-Over 3) Dark Green A. All dark green

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

Page 11: All partner pairs should have: 1) Dark Blue A. All dark blue B. Cross-Over 2) Light Blue A. All light blue B. Cross-Over 3) Dark Green A. All dark green

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