1 / 13

Genetics Practice

Genetics Practice. Do Now: match the following words with their definitions. Sponge Bob Genetics. Review & Questions. Genetics Self-Test. You have 15 minutes to complete 10 genetics questions which range in difficulty from easy to very hard.

dolf
Download Presentation

Genetics Practice

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. Genetics Practice Do Now: match the following words with their definitions

  2. Sponge Bob Genetics • Review & Questions

  3. Genetics Self-Test • You have 15 minutes to complete 10 genetics questions which range in difficulty from easy to very hard. • The self-test will not be graded, but it will let you know how well you understand the material we’ve been working on for the last week

  4. Self-test Results • Bear hair • Since straight hair is dominant: • SS  straight hair • Ss  straight hair (heterozygous) • Ss  curly hair

  5. Bear-hair cross • Heterozygous bear on top, curly haired bear on side. • Genotype ratio: 1:1 Ss:ss • Phenotype ratio: 1:1 straight:curly

  6. Heterozygous Bear Cross • Genotype ratio: 1:2:1 SS:Ss:ss • Phenotype ratio 3:1 straight:curly

  7. Fruit Flies • Since white eyes are recessive to red eyes, the white-eyed fly must have the rr genotype. • Since the cross produced some white eyed offspring, the red-eyed parent must be a heterozygote. • Since the phenotype ratio is 1:1, you should expect an equal number of red-eyed and white-eyed offspring (60)

  8. Two red-eyed flies with white-eyed offspring • Since this cross produced white-eyed offspring, both parents must have had a copy of the recessive allele. In other words, they are both heterozygous. • Since the phenotype ratio of the cross is 3:1 red:white, we expect there will only be 1/3 as many white eyed flies as red. (10)

  9. Codominance • Since there are 3 phenotypes (red, white, and roan), you immediately know this is codominance or incomplete dominance • Since the third phenotype is a result of BOTH alleles being expressed, it must be codiminance. • Red x Roan = 50% will be roan

  10. Roan x Roan • 1:2:1 Red:Roan:White

  11. Morning Glories • Since the third phenotype in this example is a blending of the two phenotypes, it is an example of incomplete dominance • VV = violet • VV’ = light purple • V’V’ = white • 1:2:1 violet:light purple: white

  12. Sex-linked heredity • When a gene is located on the sex chromosomes, it is said to be a sex-linked trait • X+X+ normal f • X+Xo carrier f • XoXo color-blind f • X+Y normal m • XoY color-blind m • 50% of males will be color blind • 50% of females will be carriers

  13. Rate Yourself • Only count a question as right if you got ALL parts right • < 6 right = deep trouble • 6-7 right = not too good • 8 right = on track • 9 right = nice • 10 right = AWESOME!

More Related