‘A’ at gene 1 is completely dominant to ‘a’, and ‘A’ encodes stiff ears, while ‘a’...
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‘A’ at gene 1 is completely dominant to ‘a’, and ‘A’ encodes stiff ears, while ‘a’ encodes floppy ears
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‘B’ at gene 2 is completely dominant to ‘b’ and ‘B’ encodes tall individuals while ‘b’ encodes short individuals.
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The genes do not interact and do assort independently.
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Given this, what genotypic and phenotypic ratios do you expect from an AaBb vs. AaBb cross?
Homework Answers
AaBb* AaBb
| AB | Ab | aB | ab | |
| AB | AABB (stiff ears, tall) | AABb (stiff ears, tall) | AaBB (stiff ears, tall) | AaBb (stiff ears, tall) |
| Ab | AABb (stiff ears, tall) | AAbb (stiff ears, short) | AaBb (stiff ears, tall) | Aabb (stiff ears, short) |
| aB | AaBB (stiff ears, tall) | AaBb (stiff ears, tall) | aaBB (floppy ears, tall) | aaBb (floppy ears, tall) |
| ab | AaBb (stiff ears, tall) | Aabb(stiff ears, short) | aaBb (floppy ears, tall) | aabb (floppy ears, short) |
the genotypic ratio is
AABB:AABb:AaBB:AaBb:AAbb:Aabb:aaBB:aaBb:aabb=1:2:2:4:1:2:1:2:1
the phenotypic ratio is
Stiff ears, tall : stiff ears, short: floppy ears, tall: floppy ears, short=9:3:3:1
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