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Multiple Alleles – Blood Type

i. The best example for humans is blood . There 3 alleles for blood types in humans: A , B and O . A and B are co dominant while O is recessive. d. Multiple Alleles – Instead of having two forms of an allele, there are more than two for one gene.

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Multiple Alleles – Blood Type

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  1. i. The best example for humans is blood. There 3 alleles for blood types in humans: A, B and O. A and B are co dominant while O is recessive. d. Multiple Alleles – Instead of having two forms of an allele, there are more than two for one gene.

  2. Type A genotypes could be: IAIA orIAi. Type B genotypes could be: IBIB or IBi. Type AB genotype is: IAIB Type O genotype is: ii Multiple Alleles – Blood Type

  3. Practice A man who is heterozygous for type A blood marries a woman who is heterozygous for type B blood. Find the possible outcomes

  4. i. Autonomies – there are 44 (22, pairs) of non sex chromosomes. ii. Sex Chromosomes – the 23rd pair of chromosomes are the sex chromosomes. The genotype for females is XX; the genotype for males is XY. e. Sex linked traits

  5. iii. Sex linked traits – Are genes located on the X chromosome. There is almost no information located on the Y chromosome. Since males have only one X chromosome they show whatever allele is on the X chromosome, regardless of whether it is dominant or recessive. e. Sex linked traits

  6. iii. This is the only time that a single recessive allele is expressed. Two examples of sex-linked traits in humans are red/green colorblindness and hemophillia. (A recessive sex linked trait that keeps your blood from clotting.) e. Sex linked traits

  7. Color Test

  8. Color Test

  9. Color Test

  10. Color Test

  11. If normal vision (N) is dominant to colorblindness (n) give the genotypes for each of the following: A female carrier: XNXn A homozygous dominant female: XNXN Colorblind male: XnY Colorblind female: XnXn A male with normal vision: XNY Sex linked traits - Colorblindness

  12. Who does the male get the X chromosome from? Mother Who does a male inherit recessive sex linked traits from? Mother Who are colorblind more often, men or women? Men; no information on Y to mask the recessive trait on X. Sex linked traits

  13. Practice A female carrier has a child with a male with normal vision. What are the chances of colorblindness occuring in: Son? Daughter?

  14. Practice A colorblind male has a child with a normal female. Fill out the cross.

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