symbols to know for crosses
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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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
![Page 2: Symbols to Know for Crosses](https://reader036.vdocument.in/reader036/viewer/2022082611/56812c31550346895d90b424/html5/thumbnails/2.jpg)
Series 1: Autosomal Unlinked
Hermaphrodite Parent genotype
Male Parent genotype X
Male gametesHermaphrodite gametes
F1 Progeny genotypes
Which progeny are you continuing with? Why?
F1 Progeny phenotypesand ratios
+/+ ; +/+ dpy/dpy; unc/unc
![Page 3: Symbols to Know for Crosses](https://reader036.vdocument.in/reader036/viewer/2022082611/56812c31550346895d90b424/html5/thumbnails/3.jpg)
Series 1: Autosomal Unlinked
F1 parent
X self cross
F1 gametes
F2 Progeny genotype
F2 Progeny phenotypes and ratios
students can show Punnet Square
![Page 4: Symbols to Know for Crosses](https://reader036.vdocument.in/reader036/viewer/2022082611/56812c31550346895d90b424/html5/thumbnails/4.jpg)
Series 1: Autosomal Linked
Hermaphrodite Parent genotype
Male Parent genotype X
Male gametesHermaphrodite gametes
F1 Progeny genotype
Which progeny are you continuing with? Why?
F1 Progeny phenotypesand ratios
+ + / + + dpy unc/dpy unc
![Page 5: Symbols to Know for Crosses](https://reader036.vdocument.in/reader036/viewer/2022082611/56812c31550346895d90b424/html5/thumbnails/5.jpg)
F1 parent
X self cross
F1 gametes
F2 Progeny genotype
F2 Progeny phenotypesand ratios
![Page 6: Symbols to Know for Crosses](https://reader036.vdocument.in/reader036/viewer/2022082611/56812c31550346895d90b424/html5/thumbnails/6.jpg)
Series 1: One Autosomal, One x-linked
Hermaphrodite Parent genotype
Male Parent genotype X
Male gametesHermaphrodite gametes
F1 Progeny genotype
With which progeny are you continuing? Why?
F1 Progeny phenotypesand ratios
+/+ ; +/0gene-1/gene1; x-gene2/x-gene2
![Page 7: Symbols to Know for Crosses](https://reader036.vdocument.in/reader036/viewer/2022082611/56812c31550346895d90b424/html5/thumbnails/7.jpg)
F1 parent
X self cross
F1 gametes
F2 Progeny genotypes
F2 Progeny phenotypesand ratios
Series 1: One Autosomal, One x-linked