Question

B> ;L I: Assume simple dominance B-brown-fur, byellow-fur, L-small-ear, 1-large-ear For the given true-breeding parentals, perform the following: a) Cross the two parental lines and determine the genetype and phenotype of all offspring. (we will call these offspring the FI generation) b) Perform a self-cross of the Fl progeny. You must fill a Punnett square to demonstrate the genotype of all the offspring of this cross, (which we will call the F2 generation) e) Determine ratio of the various F2 phenotypes 18) The white gene is an X-linked gene for eye color in Drosophila. The wild type phenotype, red is dominant over white eyes. Cross a white-eyed female with a red-eyed male and show the Punnett square and the ratio of offspring phenotype (and sexes). Does this cross provide evidence that the white gene is sex-linked? YES or NO 1) A rare human disease afflicted a family as shown in this pedigree.

Answer 1

1.This is a dihybrid cross involving 2 characters like fur color and size of ear.

0 Q b) Selfing on fi Parents Bbel X Bbel Gamets @ @ @16D BIMBU 6061 Cramets Boll BBLL Boll Boll Brownfus Browndu Brown Bocco, longe ces Small east looge Speall 2 Brown omall Brown small Brown Brown small small B BBL BBLL Bb/ZBbLL 60 Bble Bbll bbel bblL (by BbIL BOLL bbel bbLL Doron aon Yellow Yellow Smar Yellow Brown,smal Bocconill small Yellow small renot TO 2 brocon Tura are 9100 Jar o Phenolupic aatio 3 bacon fun with large eas : 9 brown fur worth Small eax : 3 Yellow far with small eax: 1 Yellow fur with large year Genotypic ratio 9:3:31

of Ratio of Fa generation Phenotypic ratio 9 brown fur with small ear: 3 brown duo with Lange ear: 3 yellow fun with small ear : 1 yellow fus ewith loage ear.