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Understanding Dihybrid Crosses and Inheritance Patterns in Genetics

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Dive into the fascinating world of genetics with our activity on Dihybrid Crosses. In this lesson, you will explore the combinations of traits in a cross between two organisms, focusing on the genotypes Ggff and ggFF. Learn to calculate the ratios of phenotypes related to color and feather presence while distinguishing between Mendelian and non-Mendelian inheritance. We’ll also cover incomplete dominance and codominance, highlighting real-world examples. Complete this engaging handout and prepare for the exit ticket involving pedigree and karyotype analysis.

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Understanding Dihybrid Crosses and Inheritance Patterns in Genetics

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  1. WELCOME BACK! IN ACTIVITY: Pick-Up & Finish the Wkst “Dihybrid Cross Practice” In your ISN complete the following Dihybrid Cross: Ggff x ggFF Bird Info: G=Green; g=Gold; F=Feathers; f=No feathers Describe 4 Ratios for each Phenotype (G,g,F,&f)

  2. Genetics – The Study of Heredity TEKS 6F Predict possible outcomes of various genetic combinations such as monohybrid crosses, dihybrid crosses, and non-Mendelian inheritance

  3. Dihybrid Cross: crosses with two different traits

  4. Non-Mendalian Inheritance What Gregor Mendel didn’t know….

  5. R R W W Incomplete Dominance • One allele is not completely dominant over another and the traits combine RW RW RW RW

  6. R R W RW RW RW RW W Incomplete Dominance Questions: A. List the possible genotypes and phenotypes. genotypes – phenotypes – B. How many of the plants would have red flowers? C. How many would have white flowers? D. How many would have pink flowers? RW Pink 0% 0% 100%

  7. B B W W EXAMPLE: Black cow + White cow = Spotted cow Codominance BW BW BW BW • BOTH traits are fully expressed in all offspring! *Chick-Fil-A Cow!!!!

  8. Codominance Example: Blood Type O (ii) X Blood Type A (IAIA) i i IA IAi IAi • Both alleles are fully expressed • Example: Blood Types 1. TypeA = IAIAorIAi 2. Type B = IBIBorIBi 3. Type AB = IAIB 4. TypeO = ii IA IAi IAi

  9. Codominance • GENOTYPES???? • IAIA = ______ of ______=____% = Type________ • IAi = ______ of ______=____% = Type________ • IBIB = ______ of ______=____% = Type________ • IBi = ______ of ______=____% = Type________ • IAIB = ______ of ______=____% = Type________ • Ii = ______ of ______=____% = Type________

  10. Sex-Linked Traits (sex-linked genes) • Pattern of inheritance on the “X” and “Y” chromosomes (X X= female; XY=male) • Most are found on “X” chromosome • Examples: Colorblindness & Hemophelia

  11. Colorblindness Test

  12. Polygenic Traits • Controlled by 2 or more genes and result in phenotype variations that can be represented by a “bell curve” (Ex. Height, Skin Color)

  13. INCOMPLETE & CODOMINANCE SEX LINKED GENES(Turn-in for Grade) Activity:Non-MendElian InheritancePRACTICE HANDOUTS

  14. EXIT TICKET: Intro. Pedigree’s

  15. Karyotype Analysis • To analyze chromosomes, we cut up and assemble photographs of chromosomes in pairs. • There are 44 autosomal chromosomes and 2 sex chromosomes in humans.

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