MONDAY Genetics Worksheet BIO-1 Answer the following questions on a separate pie

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MONDAY Genetics Worksheet BIO-1 Answer the following questions on a separate piece of paper. You MUST SHOW YOUR WORK In Jurassic Park, blood from dinosaurs was found in mosquitoes trapped in amber. DNA from the blood was used to clone live beasts. If this had been true, we would also have been able to eventualy learn much about Jurassic genetics. Let's pretend that 1. It was found that in T. rex a single gene controlled claw shape, and that curled claws were dominant to straight claws (Let C curled allele and c straight allele) Give all the possible genotypes and their associated phenotypes. clawed beast. Show the genotypes and phenotypes of the P and Fi animals. proportions would you expect in the Fa a. b. Say you were to cross a pure-breeding curled clawed T. rex with a pure-breeding straight c. You then crossed two of the F, animals with each other. What genotypic and phenotypic 2. Diplodocus was a gentle, long necked plant eater. Say our breeding experiments show that these animals came in three colors: black, gray, and white. You also know that a single gene you get all gray Fi offspring. If you then cross the gray offspring with each other, in the F2 you controls color. You find that if you cross a pure-breeding black with a pure-breeding white animal get black, gray, and white in a 1:2:1 ratio. a. Explain the genetic mechanism behind color in Diplodocus. b. Imustrate the crosses explained above using Punnett squares (ncluding the genotypes and phenotypes of the P, F, and F2) 3. In the predatory Allosaurus a single gene with two alleles controlled tail length. The long tail allele (L) is dominant to the short tail allele (). Give the genotypes and phenotypes of parents and offspring (also give expected ratios for offspring) for the following crosses: a. Pure-breeding long X Heterozygote b. Heterozygote X Heterozygote c. A tough one. You have a long tailed animal, but you aren't sure of its genotype. You crossed it to a short tailed animal and get some long and some short tailed offspring. What is its genotype? How do you know? 4. Velociraptors are nasty! Actually they come in a whole range of nastiness, from sort of nasty to really, really nasty. What is the probable mechanism which determines nastiness in these beasts?

Explanation / Answer

1.a)

b) The cross will be- CC x cc

Gametes will be- C (From CC) & c (From cc)

c) The cross will be- Cc x Cc

Gametes will be- C & c (From both cross,i.e., Cc)

The genotype & phenotype of F2 will be-

Therefore, genotypic ratio in 1:2:1 & phenotypic ratio in 3:1 in F2.

2.a) The genetic mechanism that is behind in the color of Diplodocus is incomplete dominance. In this case phenotype of heterozygote is intermediate between the phenotypes of two homozygotes. As in this case cross between pure-breeding black & pure-breeding white generate offspring with gray, which is intermediate between the two color.

b) Let genotype of black is BB & white is WW. Gray will be denote by heterozygote,i.e., BW. Then the cross in P generation-

P generation- BB x WW

Then the phenotype & genotype in F1 will be-

Now, the phenotype & genotype in F2 will be-

Genotype Phenotype CC Curled claw Cc Curled claw cc Straight claw

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