bloodtypes.doc - Name Period Blood Types Multiple Alleles and Codominance In humans there are four blood types(phenotypes A B AB and O Blood type is

bloodtypes.doc - Name Period Blood Types Multiple Alleles...

This preview shows page 1 - 2 out of 2 pages.

Name Period Blood Types - Multiple Alleles and Codominance In humans, there are four blood types (phenotypes): A, B, AB, and O Blood type is controlled by three alleles A, B, O found on chromosome 9 O is recessive, two O alleles must be present for the person to have type O blood A and B are codominant . If a person receives an A allele and a B allele, their blood type is type AB Crosses involving blood type often use an I to denote the alleles - see chart. Blood Type Genotype Can Receive Blood From: A I A I A I A i AA AO A or O B I B I B I B i BB BO B or O AB I A I B AB A,B, AB, or O O ii OO O When doing blood type crosses, you will need to know whether at type A or B person is heterozygous or homozygous. Type O's are automatically OO and type AB is automatically AB. Crosses are performed the same as any other using a Punnett square. 1. Write the genotype for each person based on the description: a. Homozygous for the “B” allele ______ b. Heterozygous for the “A” allele ______ c. Type O ______ d.
Image of page 1
Image of page 2

You've reached the end of your free preview.

Want to read both pages?

  • Fall '17
  • Bryan Derrickson

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

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes
A+ icon
Ask Expert Tutors