1 / 6

Symbols to Know for Crosses

Symbols to Know for Crosses. a/a – a is the allele and / represents the two chromatids – there are two alleles for a diploid organism a b/a b – two different genes on the same chromosome a/a ; b/b – two different genes on different chromosomes ; designated separate chromosomes

sandro
Download Presentation

Symbols to Know for Crosses

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Symbols to Know for Crosses • a/a – a is the allele and / represents the two chromatids – there are two alleles for a diploid organism • a b/a b – two different genes on the same chromosome • a/a ; b/b – two different genes on different chromosomes ; designated separate chromosomes • X – symbolizes mating between two different individuals • X - symbolizes a self cross – when the hermaphrodite worms fertilize their own eggs • + is the wild type or non-mutant form of a gene

  2. Hermaphrodite Parent genotype dpy/dpy +/+ Male Parent genotype X Creating a heterozygous male Female gametes Male gametes Progeny genotype Progeny phenotypes and ratios Which progeny are you continuing with? Why?

  3. Linkage 1: Cross with Unlinked unc Hermaphrodite Parent genotype +/+ ; unc/unc Male Parent genotype X Female gametes Male gametes F1 Progeny genotype and ratios F1 Progeny phenotypes

  4. Linkage 2: Selfing of hermaphrodite from unlinked cross hermaphrodite self cross X gametes Progeny genotype Progeny phenotypes and ratios

  5. Linkage 1: Crossing with Linked unc Hermaphrodite Parent genotype Male Parent genotype + unc/+ unc X Female gametes Male gametes Progeny genotype Progeny phenotypes and ratios Which progeny are you continuing with? Why?

  6. Linkage 2: Selfing of hermaphrodite from linked cross hermaphrodite self cross X gametes Progeny genotype Progeny phenotypes and ratios

More Related