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Understanding Dihybrid Crosses and Inheritance Patterns in Genetics

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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