D3 - Bio 311D: Introductory Biology II Discussion #3 Todays...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Today’s topics More Genetics (abnormal chromosomes) Population Genetics Evolution Quiz 2 (memorization test) Bio 311D: Introductory Biology II Discussion #3
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Review Session for Exam #1 Thursday Sep 22th 5pm-6:30pm, RLM 4.102 Attendance is optional
Background image of page 2
6. Assuming an unknown disease affected by one gene, in a family, both parents are heterozygous on this gene but not affected by the disease. They have 10 children (5 sons, 5 daughters). All the boys show the disease symptom in early age. The most likely inheritance pattern of this disease gene is: A. Autosomal dominant B. Autosomal recessive C. Sex-linked dominant D. Sex-linked recessive Quiz 1 Multiple Choice #6
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Changes in Chromosome Structure
Background image of page 4
Aneuploid : a few chromosomes change (result from unequal segregation during meiosis) Sex chromosome changes i.e. XXY Autosome changes i.e. 3 Chromosome #21 (Down syndrome) Polyploid : whole set of chromosomes get changed (duplicated) i.e. 3n (69 chromosomes in human), 4n, …… Infertility . Seedless watermelon is a polyploid (3n) Changes in Chromosome Number
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Disease Abnormal chromosome Total #Chromos omes Gender affected Symptom Changes in number of Sex chromosomes Klincfelter syndrome XXY 2n = 47 Male Speck syndrome XYY 2n = 47 Male Turner syndrome X 2n = 45 Female Trisomy X XXX 2n = 47 Female Changes in number of autosomes Down Syndrome (Trisomy 21) 3 copies of Chr #21 2n = 47 Male or female
Background image of page 6
Dosage compensation Genetic regulatory mechanism which operates to equalize the phenotypic expression of characteristics determined by genes on the X chromosome so that they are equally expressed in the human XY male and the XX female. Female:
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 24

D3 - Bio 311D: Introductory Biology II Discussion #3 Todays...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online