2.03.06 L47 - February 11, 2008 Lecture 5: Sex Linkage, and...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
May 12, 2009 Lecture 5: Sex Linkage, and when it goes wrong Sex-Linkage Morgan has female and male flies with two kinds of eyes, and he crossed them to make the F1,  and crossed those to make the F2, but his test-cross didn’t come out right He suggested that there was no gene on the Y chromosome This works! The criss-cross also works! Also supported when done on birds Third line of support: o Aneuploidy  – What happens what a homologous pair of chromosomes doesn’t split upin  Anaphase I.  o You end up getting two triploid (three chromosomes) daughter cells and 2 monosomic (1  chromosome only) cells) o Causes Downs Syndrome  When Sex-Linkage goes wrong… XwXw x XWY In 1 in 2000 cases, you get white females and red, sterile males.  You got the opposite of what was expected.  Bridges Reasoning o You get an XX and a nothing, 
Background image of page 1

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

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/11/2008 for the course BIO G 101 taught by Professor Gilbert,c. during the Fall '07 term at Cornell University (Engineering School).

Page1 / 2

2.03.06 L47 - February 11, 2008 Lecture 5: Sex Linkage, and...

This preview shows document pages 1 - 2. Sign up to view the full document.

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