Name: (25 points) 7) You have discovered a new species of gamecock that has vari

Question

Name: (25 points) 7) You have discovered a new species of gamecock that has variations in color of tail feathers and claws. Some animals have white tail feathers, while others have purple tail feathers. Some animals have white claws or green claws. Based on your initial experiments, you find that tail feather color and claw color are controlled by two separate genes on different chromosomes. After analyzing the P1, F1 and F2 generations starting from a cross of true-breeding parents for each trait, you realize that purple is dominant to white (tail feather color) and white is dominant to green (claw color). Based on this information and the following data, answer the questions below. (Numbers in parentheses indicates how may offspring displaying the phenotype) (35) (43) (30) (38) 7.1 Record the letter designations for each allele for each gene. (0.5 pts) 7.2 Write the correct genotypes for each parent and all offspring on the lines below each individual. (0.5 pts each) 7.3 Show a Punnett square that helped you arrive at these conclusions. (1 pt)

Explanation / Answer

7.1 dominant purple gene- P; recessive white feather gene- p; dominant white claw gene- W; recessive green claw- w

7.2 P1- ppww (recessive trait) X P2- PpWw (dominant traits) ; offspring genotypes (from left to right)-

O1- Ppww/PPww ; O2- PpWw/ PPWW ; O3- ppww; O4- ppWw/ ppWW

7.3 allelic pairs from (gametes) P1- pw, pw, pw, pw; allelic pairs(gametes) from P2- PW, Pw, pW, pw

when crossed; F1- PpWw:Ppww:ppWw:ppww (1:1:1:1)

7.4 Purple tailed, white clawed- PPWW; PpWw; PPWw; PpWW

7.5 Test cross would be better to test dominance of trait- Genotypic ratio: 1:2:2:4:2:2:2:1 phenotypic ratio-9:7

7.6 probability of obtaining purple tail= 13/16

*cross for answer 7.5 &7.6 is as follows:

P1- PW, Pw, pW, pw x P2- PW, Pw, pW, pw

gametes PW Pw pW pw PW PPWW PPWw PpWW PpWw Pw PPWw PPww PpWw Ppww pW PpWW PpWw ppWW ppWw pw PpWw Ppww ppWw ppww

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