Beginning of meiosis

Thursday February 21^st

During meiosis 1, what pairs up in the nucleus? Homologous Chromosomes (It is important that you know it's the homologous chromosomes and not JUST chromosomes.  Chromosomes line up during Mitosis - but during meiosis this first step of homologous chromosomes pairing is VERY important!!!)

During this time, the legs of chromosomes can swap DNA in a process known as Crossing Over. (keep in mind, this is not what we would call a mutation because it is swapping DNA from the same section of a chromosome.  It just results in some of your moms dna being found on your dads chromosome.)

In order for meiosis to create four, genetcially different gametes, DNA replication must occur.  Which of these best describes when DNA replication would occur during meiosis?

A.  Interphase of meiosis I                 
B.  Anaphase I in meiosis I      

C. Interphase in meiosis II  
        D.  Anaphase II in meiosis II

DNA replication will ALWAYS occur before mitosis OR meiosis begins

Which statement BEST describes the relationship between an allele and a gene?

A.  An allele is a variation of a gene that can be expressed as a phenotype.

B.  An allele is the part of a gene that attaches to messenger RNA molecules

C.  An allele is a segment of a DNA molecule that controls replication of a gene

D.  An allele is the primary protein made by a gene found in a developing embryo.

After this I had you write down One slide on meiosis II and then let you read a little more about the entire process of meiosis and fill out a directed reading.  Don't forget - DAILY QUESTION QUIZ TOMORROW!!!!!!  The questions will come from this week and last week since we didn't have one last week.