1 / 21

Drill #15

Drill #15. Quote : Along with success comes a reputation for wisdom . Euripides Agenda: Exceptions to Mendelian Genetics Review Session Warm-up: Name 2 of your favorite Thanksgiving foods and the corresponding macromolecule category. . Mendelian Exceptions. Chapter 11 Section 3.

melosa
Download Presentation

Drill #15

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Drill #15 Quote: Along with success comes a reputation for wisdom.Euripides Agenda: Exceptions to Mendelian Genetics Review Session Warm-up: Name 2 of your favorite Thanksgiving foods and the corresponding macromolecule category.

  2. Mendelian Exceptions Chapter 11 Section 3

  3. Mendel’s Principles Revisited • Inheritance of biological _____________ is determined by individual units known as ______. • During sexual reproduction, genes are passed from parents to _________. • Two or more forms of the gene for a single _____ exist, some forms of the gene may be _________ and others may be recessive. characteristics genes offspring trait dominant

  4. Mendel’s Principles Revisited • Organisms typically have ____copies of each gene, (one from each _______) • An organism’s _____ of genes (2 alleles) are segregated from each other when ________ are formed. • Alleles for different ______ usually segregate _____________ of one another. (through meiosis) • (Law of Independent Assortment) two parent pair gametes genes independently

  5. Independent Assortment in Peas __ Round yellow __ Round green __ Wrinkled yellow __ Wrinkled green 9 3 3 1

  6. Incomplete Dominance • In incomplete dominance, neither allele is __________ so there is a blending of ______ when two different alleles for the same trait occur together. • Colors blend together • (______________ individuals = 3rd phenotype) dominant traits heterozygous red pink white

  7. Incomplete Dominance RR • In Four O’ Clocks, if you cross a red _____(which is always pure) with a white _____ (that is also always pure) , you get apink _____ (whichis always hybrid /heterozygous WW RW RW RW RW RW

  8. Incomplete Dominance • In another flower, if red ____ and blue ____ flowers are crossed, they produce a 3rd purple ____ flower • What would be the genotype ratio and phenotype ratio if you crossed two purple flowers? RR BB RB

  9. Incomplete Dominance • Cross of two purple flowers____ X ____ • What are gamete possibilities? • genotype ratio 1RR : 2RB : 1BB • phenotype ratio 1red : 2 purple : 1 blue • Can you have a heterozygous red orhybrid blue flower? ___ RB RB R B RR RB R red purple BB RB B purple blue no

  10. Codominance alleles • Both _______ contribute to the phenotype of the organism by showing up simultaneously (at the same time) in heterozygous individuals. • In cattle and horses, if you cross a pure ____ (RR) with a pure ______ (WW), you get (RW) which produces the color _____. red white roan

  11. Codominance • These cattle or horses actually have both red and white hairs intermixed, or are spotted. Roan is a third ___________. • If you cross a roan with a white… phenotype R W RW WW W roan white RW WW W roan white

  12. Codominance • Andalusian chickens also show this pattern of inheritance. • If you cross a black (BB) chicken • With a white (WW) chicken • You get black+white speckled (BW) chicken

  13. Multiple Alleles • In this pattern of inheritance, the genes have more than _____ alleles controlling them and are therefore said to have multiple alleles. No individual has more than _____ alleles, but there are more than _____ possible alleles in a population, so a ______ will be expressed in more than two forms. two two two trait

  14. Multiple Alleles • Blood type in humans is an example of this inheritance pattern. • The ______ different blood groups: • A, B, O, and AB • Are produced by ______ different alleles: • A, B, and O four three

  15. Multiple Alleles • Examples of Blood type crosses

  16. Multiple Alleles • Blood Groups Antigen on Red Blood Cell Safe Transfusions Phenotype (Blood Type Genotype From To

  17. Multiple Alleles rabbit • The example of _______ hair color, which has at least four different alleles, (on text pg 273) is seen in these different Rex rabbits.

  18. Polygenic Traits • Traits controlled by two or more genes • Show a wide range of phenotypes • The phenotype is produced by the interaction of more than ________ of genes. 1 pair

  19. Polygenic Traits polygenic • These are called ___________ traits, which means “having _______ genes”. • In humans, _____ color, • _____ color, many eye skin

  20. Polygenic Traits polygenic • These are called ___________ traits, which means “having _______ genes”. • In humans, _____ color, • _____ color, • and _____ color many eye skin hair

  21. Polygenic Traits polygenic • These are called ___________ traits, which means “having _______ genes”. • In humans, _____ color, • _____ color, • and _____ color • are just a few of the many traits __________ by many genes. many eye skin hair controlled

More Related