Sally Y.
What did we do in class today?
• Went over UP pgs. 63~72
• Pedigree chart
• Homework: Lab #35, UP 92 A-F
• Possibility of a quiz tomorrow or Friday!
Pedigree Chart
What is a pedigree chart?
A pedigree chart is a chart that shows the phenotypes of an organism and its ancestors.
<---------- P1 Generation (Parents)
<---------- F1 Generation (Kids in birth order)
<---------- F2 Generation (Grandkids)
You can identify the phenotypes of each shape by looking at the key!
• every rectangle would be male and every circle would be female
• rectangle filled with only orange, we know that phenotype would be a colorblind male
• rectangle is filled entirely with yellow, it is a male with normal vision
• circle contains only yellow, it is a female with normal vision
• a circle with half orange and half yellow would have normal vision with a recessive gene
Note: If you are unsure of whether or not the gene is homozygous or recessive, leave the second allele blank. DO NOT ASSUME!
Next Scribe: James C
Is a phenotype chart only for sex-linked traits?
ReplyDelete(Comment #1)
Yes I think it is. This is because the female is shaded with 2 colors, indicating that she is a carrier for the recessive gene while the dominant gene is shown.
ReplyDeletei think a phenotype chart can be used for sex-linked traits as well as other crosses, because in Lab 35, it used the ability to taste PTC, and i don't think that is a sex-linked trait.
ReplyDeleteFYI...It is called a pedigree chart. And it can be used for ALL types of traits. You will know if it is a sex-linked trait due to the 1/2 shaded sircles (carrier female). Let me know if you have more questions about this...Mrs. A
ReplyDelete