Genetic Disorders

Agenda: 

• Take out UP 40-41 w/ stampsheet
• Talk about X-linked chromosomes
• Work on UP 43-52

  Today we started off the day talking about how NASA had discovered a bacteria without phosphate in its DNA. Instead, it has arsenic, which is poisonous to us. You can find more information about this on Mrs. Stien's previous posts.

  Next we talked about X-linked chromosomes.

Multiple Alleles- Blood Types

• The "A" and "B" alleles are codominant to each other 
• The O allele is recesive

Possible phenotypes and genotypes include:

 Phenotypes                                        Genototypes

·         Type A                                    I^AI^A or I^Ai

·         Type B                                    I^BI^B or I^Bi

·         Type AB                                 I^AI^B

·         Type O                                   ii  

Blood Type Chart

Human Chromosomes

• 22 pairs of autosomes and 1 pair of sex chromosomes - autosomes are all of the chromosomes that aren't sex chromosomes 
• Many genetic disorders are autosomal recessive 
• Sex- linked disorders are on the X chromosome; many are recessive 

Sex-Linked Disorders

• allele is only found on the X chromosome
• more common in men; men cannot be carriers

If you're still confused and want more information, Mrs. Stein posted some videos that should be helpful.

Homework:

• Read 14.2 and go online to https://www.pearsonsuccessnet.com/snpapp/login/login.jsp and do the activities and the quiz for that section
• UP 43-46 (due tomorrow)
• UP 47-52 (due Wed.) 
• Quiz Thur. 

The next scribe will be Julie