Chapter 2 Biological and Environmental Foundations

Chapter 2 Biological and Environmental Foundations - Andrew...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Andrew Lynn 1/29/08 Notes: Chapter Two I. Genetic Foundations A. Genotype B. Phenotype C. Chromosomes 1. 26 pairs in gametes 2. 46 in body cells 3. first 22 pairs—autosomes 4. 24-26—gametes D. Genetic Code 1. DNA 2. Chromosomes 3. Genes 4. Mitosis 5. Meiosis E. Boy v. Girl 1. Women have genetic advantage over ment 2. Boys more likely to be aborted F. Multiple Births 1. Fraternal/dizyogtic, 2 eggs 2. Identical/monozygotic, 1 egg splits G. Genetic Inheritance 1. Allele—two forms of each gene i. One form from each parent ii. BB, Bb, bb 2. Homozygous—two identical alleles i. BB ii. bb 3. Heterozygous—two different alleles i. Bb ii. Dominate/Recessive Inheritance—pattern of inheritance, only one allele is apparent iii. Carriers—recessive allele still expressed perhaps in future offspring iv. Incomplete Dominance—both alleles are expressed in the phenotype (a) Sickle cell trait—in certain conditions sickle cell anemiea occurs—blood cells shaped like sickles that block the flow of blood 4. X-linked inheritance—recessive gene is carried on the X chromosome so males are more likely to be affected. i. Info on the X doesn’t that opportunity to be cancelled out by the Y ii. Hemophilia—blood doesn’t clot 5. Genetic Imprinting—chemically marked, one pair is activated 1 of 4
Image of page 1

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

View Full Document Right Arrow Icon
Andrew Lynn 1/29/08 regardless of it’s make up i. Explains childhood diabetes where only father or mother has
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern