Wake-up (Presentation Mode) 1.There are 40 chromosomes in a cell. a.How many would be present in a cell after meiosis? b.How many would be present in a cell after mitosis? 2.Explain the difference in the cells produced in meiosis from those produced in mitosis. 3.How many chromosomes do humans have? a.What is our diploid number? b.What is our haploid number?

Meiosis and Punnett Squares Make sure PowerPoint is in Presentation mode Christopherson

Punnett Square Tool used to predict the genotypes and phenotypes of offspring

Brief summary of Meiosis Process in which gametes (sex cells) are made Need to split apart the homologous pairs; reduce # of chromosomes by 1/2

What does Meiosis have to do with Punnett Squares? Meiosis separates the alleles of a parent into different sex cells (gametes).

A heterozygous male has a child with a female with dimples. Dimples are a recessive trait. What are the predicted results? Male Genotype Dd

Go grab a plastic container of markers/colored pencils. You should have one per table. I would like the diagram to be in color in your notes.

Homologous Pairs DNA is Replicated Male: Dd D d

Process: Meiosis Meiosis I Homologous Pairs are separated Meiosis II Sister Chromatids are separated dd D D DDdd d d D D

A heterozygous male has a child with a female with dimples. Dimples are a recessive trait. What are the predicted results? Female Genotype dd

Homologous Pairs DNA is Replicated Female: dd d d

Process: Meiosis Meiosis I Homologous Pairs are separated Meiosis II Sister Chromatids are separated dd d d dddd d d d d

Fertilization Combination of the egg and sperm to form a zygote

Process: Fertilization Homologous Pairs EggSperm Zygote dDd D Pick any egg and any sperm and draw them in your notes.

A heterozygous male has a child with a female with dimples. Dimples are a recessive trait. What are the predicted results? Complete the Punnett Square. Female Genotype dd Male Genotype Dd

A heterozygous male has a child with a female with dimples. Dimples are a recessive trait. What are the predicted results? Complete the Punnett Square. Dd x dd dd D d DdDdDdDd d d Results 50% with Dimples 50% without Dimples

Genetic Disorder Project Pick up the Genetic Disorder Project description from the substitute. Take your time and read the directions VERY clearly! When complete reading, I have linked two sites on the Wiki to help you with picking project ideas. Once you have decided on your topic, you need to post it on the class boards I created (links on Wiki). The disorders are first come first serve. Everyone will have a different topic. Check the board to see what your classmates are doing. The boards are also linked to the Wiki.