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Complex Inheritance of Human Traits. Codominance in Humans Phenotypes of both homozygotes are produced in the heterozygote Recall the checkered rooster.

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Presentation on theme: "Complex Inheritance of Human Traits. Codominance in Humans Phenotypes of both homozygotes are produced in the heterozygote Recall the checkered rooster."— Presentation transcript:

1 Complex Inheritance of Human Traits

2 Codominance in Humans Phenotypes of both homozygotes are produced in the heterozygote Recall the checkered rooster Sickle-cell anemia

3 Sickle-cell Anemia Disorder where red blood cells are sickle shaped Normally concave Shorter life span and can slow bloodflow or block small vessels 1 in 12 African Americans is heterozygous for the disorder

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5 Malaria Sickle Cell

6 Multiple Alleles in Humans Blood types Can be A, B, AB, or O

7 Type A The I A allele is dominant to i I A i or I A I A will give you type A blood Surface protein A is produced

8 Type B The I B allele is also dominant to i I B I B or I B i will =type B blood Surface protein B is produced.

9 Type AB The I A and I B alleles are codominant to each other I A I B you will have type AB blood Will produce both surface proteins

10 Type O The i allele is recessive Produces no surface molecule Homozygous ii you have blood type O

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12 Sex-Linked Traits in Humans Traits that are determined by genes that are carried on the sex chromosomes Most of these genes are located on the X chromosome

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14 Red-green Color Blindness People who have red- green color blindness can't differentiate these two colors

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16 Hemophilia: An X-linked disorder Blood fails to clot normally because of a deficiency or abnormality of one of the clotting factors 1 male in every 10 000 has hemophilia but only about one in 100 million females Why?

17 Polygenic Inheritance in Humans These kinds of traits usually represent a range of variation that is measurable Color variations in human eyes Skin color

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19 Changes in Chromosome Numbers Unusual numbers of autosomes Down syndrome: Trisomy 21 Unusual numbers of sex chromosomes Turners Syndrome and Klinefelter's Syndrome


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