In Jurassic Park, blood from dinosaurs was found in mosquitoes trapped in amber.
ID: 58167 • Letter: I
Question
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 eventually learn much about Jurassic genetics. Let's pretend that. . . 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. Say you were to cross a pure-breeding curled clawed T. rex with a pure-breeding straight clawed beast. Show the genotypes and phenotypes of the P and Fi animals. You then crossed two of the Ft animals with each other. What genotypic and phenotypic proportions would you expect in the 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 controls color. You find that if you cross a pure-breeding black with a pure-breeding white animal you get all gray F: offspring. If you then cross the gray offspring with each other, in the F2 you get black, gray, and white in a 1:2:1 ratio. Explain the genetic mechanism behind color in Diplodocus. Illustrate the crosses explained above using Punnett squares (including the genotypes and phenotypes of the P, F1t and F2.). In the predatory Alfosaurus a single gene with two alleles controlled tail length. The long tail allele (L) is dominant to the short tail allele (I). Give the genotypes and phenotypes of parents and offspring (also give expected ratios fof offspring) for the following crosses: Pure-breeding long X Heterozygote Heterozygote X Heterozygote. 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?. 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). Curved claws (C) are dominant to straight claws (c). The following are the possible genotypes and phenotypes.
CC ---> Curled claws
cC or Cc-------> Curved claws
cc -----------> Straight claws
(b) Cross between true-breeding curled claws (CC) and true breeding straight-claws (cc) will have the offspring with the following genotypes.
CC *cc (parental) ----------> F1 ---> 100% Cc (curled claws).
(c) Cross between F1 offspring will have the offspring with the following genotypes.
cC *cC = CC, Cc, cC, cc.
The genotypic proportions are, CC -------> 1/4; Cc -------------> 1/2; cc ----------> 1/4
Means 3 :1 ratio of curled to straight claws.
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