2 Complete Dominance Involves dominant and recessive alleles dominant allele always overpowers the recessive allele in appearance
3 Incomplete Dominance Neither allele is dominant or recessive Organisms with two different phenotypes produces offspring with a third phenotype that is a blending of the parents
4 Incomplete DominanceEx: Cross a red flower (RR) with a white flower (WW) and the offspring will be pink (RW)!
5 Incomplete Dominance(RR)In another flower, if red ____ and blue ____ flowers are crossed, they produce a 3rd purple ____ flowerWhat would be the genotypic ratio and phenotypic ratio if you crossed two purple flowers?(BB)(RB)
6 Incomplete Dominance Cross of two purple flowers _RB_ X _RB_ What are gamete possibilities?genotypic ratio1RR : 2RB : 1BBphenotypic ratio1red : 2 purple : 1 blueRBRRredRBpurpleBBblueRB
7 Codominance Neither allele is dominant or recessive Parents with different phenotypes produce an offspring with a third phenotypeThird phenotype will show both parental phenotypes simultaneously (at the same time)
8 CodominanceIn cattle and horses, if you cross a pure red (RR) with a pure white (WW), you get (RW) which produces the color roan.
9 CodominanceThese cattle or horses actually have both red and white hairs intermixed, or are spotted. Roan is a third phenotype.If you cross a roan with a white…RW X WWRWRWroanWWwhiteWW
12 Multiple allelestwo or more possible alleles for the same gene within a populationThus multiple allelesHowever, individuals within the population are only able to hold two of themNon-human examples: rabbit fur color, mice skin color, eye color in flies, wing size in flies
13 Multiple Alleles Blood type in humans The _four_ different blood types:A, B, O, and ABBlood types are produced by three_ different alleles:A, B and OPhenotypeGenotypeAAA or AOBBB or BOABAB onlyOOO only
14 Genotype for Blood Type I and i used in genotype I used with A and B i used with O A and B are dominant over O: A and B are codominant Ex: Genotype: AA is IAIA
15 Blood type chart PHENOTYPE GENOTYPE A AA, IAIA AO, IAi B BB, IBIB BO, IBiABAB, IAIBOOO, iiBlood type AB is an example of codominance in humans
16 Blood Type Punnett Square Draw a Punnett square showing all the possible genotypes for the offspring produced by a type “O” mother and an a Type “AB” father.iiIAiIBiCross: ii x IAIBIAIB
17 Blood Type Punnett Square Cross a female with blood type A and a male with heterozygous B blood type.Complete ratios (phenotypic and genotypic)A male with blood type B has a child with a woman who has blood type A. The child is blood type O. What is the genotype of the male and female? Show your work.
25 Sex-linked traitsEvery new born has a 50% chance of being female and a 50% chance being maleDAD: X YSperm contains either:MOM: X XEggs all contain:XYorXYXXXXXYX
26 Sex-Linked traitsThe X chromosome contains many genes, whereas the Y chromosome contains only a few genessex-linked genes: genes located on one of the sex chromosomes (X or Y) but not the othermost sex-linked genes are X-linked genes
27 Examples of sex-linked traits: X-linked Colorblindness: more common in males than femalesHemophilia: more common in males than femalesBoth colorblindness and Hemophilia are recessive traits
31 Colorblind: X-linked trait C- normal visionc- colorblindYou must incorporate XX (mom) and XY (dad)This is how to set it up:(remember colorblindness is X-linked!)Normal visionHeterozygous(carrier)ColorblindFemale: XXMale: XY
32 Punnett SquareCross a female who is a carrier for colorblindness with a normal vision man.Cross a normal vision woman (homozygous) with a colorblind man.
33 Hemophilia: X-linked recessive trait Hemophilia is the inability for blood to clotYour blood clots every time you get a papercutH: normal clottingh: hemophiliaMake a key for hemophilia:Normal female: Normal Male:Female Carrier: Can a man be a carrier?Female with hemophilia: Male with:
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