Exam 2 lecture 4

Exam 2 lecture 4 - Biology 313 Lecture 14 Sept 27, 2010...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
Biology 313 Lecture 14 Sept 27, 2010
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Phenotypes can be determined by interactions between different genes - Novel phenotypes -Epistasis
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Epistasis in AaBb x AaBb dihybrids
Background image of page 4
W_Y _ white W_ yy white ww Y_ yellow ww yy green 1 2 3 1 Dominant epistasis
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Rule of sixteenths For dihybrid progeny, express the number of individuals in sixteenths to more easily find variation from 9:3:3:1 (9 + 3 + 3 + 1 = 16) X= no. progeny with a phenotype 16 total no. progeny
Background image of page 6
Rule of sixteenths For example, in the F2 of a dyhybrid cross you obtain 63 red, 21 brown and 28 white individuals Thus: red = (63 x 16) / 112 = 9 brown= (21 x 16) / 112 = 3 white = (28 x 16) / 112 = 4 A 9:3:4 ratio is consistent with recessive epistasis (Table 5.2)
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Complementation Test Are two recessive mutations at the same locus or different loci? Are “a” and “b” allelic? To determine this, you perform a “complementation test” Begin by crossing two homozygotes for each mutation
Background image of page 8
If F1 is mutant, the two mutations are in the same gene (they are allelic) and they do NOT complement Assume “a” and “b” are allelic (same gene)
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/06/2011 for the course BIO 313 taught by Professor Rodermel during the Spring '11 term at Iowa State.

Page1 / 21

Exam 2 lecture 4 - Biology 313 Lecture 14 Sept 27, 2010...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online