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Mendelian Genetics

Mendelian Genetics. Your genes, located on your chromosomes contain dominant and recessive traits which were inherited from your parents and grandparents. Some of your characteristics are caused by only one gene from each chromosome. Dominant Traits.

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Mendelian Genetics

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  1. Mendelian Genetics

  2. Your genes, located on your chromosomes contain dominant and recessive traits which were inherited from your parents and grandparents.

  3. Some of your characteristics are caused by only one gene from each chromosome.

  4. Dominant Traits • Traits that show themselves over recessive or hidden traits • Remember that genes come in pairs- if only one is dominant the organisms will show that trait • Examples: Tongue rolling, Detached earlobes

  5. Recessive Traits • Traits that are masked or hidden by a dominant trait • Genes come in pairs- if only one is recessive it will not be expressed in the individual • Examples: Attached earlobes, straight thumb

  6. The Father of Modern Genetics • Gregor Mendel • Austrian Monk • Experimented with pea plants and noticed that they contained “factors” that were passed to offspring.

  7. Tongue Rolling • Dominant

  8. Tongue Folding • Recessive- you must have two genes to have this trait

  9. Detached Earlobes • Detached Earlobes are dominant- only one gene of the pair necessary • Attached- recessive

  10. Thumbs Hitchhikers' Thumb- Dominant Straight Thumb- Recessive

  11. Relative Finger Length Index Longer than Ring- Dominant Ring Longer than Index- Recessive

  12. Dimples- Dominant

  13. Widow’s Peak Peak- Dominant Straight- Recessive

  14. Bent Little Finger- Dominant

  15. Freckles- Dominant

  16. Whorl Counter-Clockwise- Recessive Clockwise-Dominant

  17. As you begin working genetic problems, remember- genes come in pairs

  18. Simple Dominant/Recessive Genetics Problems Homework Solutions

  19. 1. Black fur (B) in guinea pigs is dominant over white fur (b). Find the probability of a white offspring in a cross between two hybrid guinea pigs. B b B b ____%white

  20. 2. Black fur (B) in guinea pigs is dominant over white fur (b). Find the probability of a hybrid offspring in the cross: BB x Bb B B B b _______% hybrid

  21. 3. Black fur (B) in guinea pigs is dominant over white fur (b). Find the probability of a purebred offspring in a cross: BB x BB B B B B _____% purebred

  22. 4. bb x bb b b b b _________% black

  23. 5. Find the probability of an offspring with the same phenotype as its parents in a cross between a purebred black and a hybrid black guinea pig. _____% same phenotypes as parents

  24. 6. Bb x bb B b b b __________% white

  25. Variations of Mendel’s Themes

  26. Incomplete Dominance and Co-Dominance • Two traits combine or blend together to produce a different trait. • There is no dominant or recessive trait. Instead, both traits have about the sameinfluenceon the organism. • Use different letter for each trait: bb= black ww= white bw=gray

  27. Examples: Andalusian Chickens BB x WW = BW

  28. Roan Colored Horses and Cattle RR or BB x WW= RW or BW

  29. Flower Colors RR x WW = RW

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