rEPRODUCTION
Normal Dominance
Dominant Gene:
In the picture on the right, if Aa represents an oval shaped head and aa represents a long cylinder shaped head than the possibilty of the octopus haivng an oval shaped head is 50% and the possibility of an octopus having a long cylindrical head is 50%
- Head Shape: Oval(AA or Aa)
- Ear Shape: Curved(AA or Aa)
- Color: Tan(AA or Aa)
- Head Shape: Long Cylinder(aa)
- Ear Shape: Pointy(aa)
- Color: Creamy(aa)
In the picture on the right, if Aa represents an oval shaped head and aa represents a long cylinder shaped head than the possibilty of the octopus haivng an oval shaped head is 50% and the possibility of an octopus having a long cylindrical head is 50%
Incomplete Dominance
Definition: Incomplete dominance is when two dominant genes are basically mixed together because neither of the traits are dominant over each other. For example if I have a black dog and a white dog that mate they could have a grey puppy due to incomplete dominance.
Incomplete Dominance: A white octopus and a red octopus mate and have a pink octopus(Red and White show incomplete dominance).
Phenotypes:
Red(TT)
Pink(Tt)
White(tt)
Phenotypic Ratio: Red 1: Pink 2: White 1 (Red=25%, Pink=50%, White=25%)
Genotypic Ratio: TT 1: Tt 2: tt 1 (TT=25%, Tt=50%, tt=25%)
Incomplete Dominance: A white octopus and a red octopus mate and have a pink octopus(Red and White show incomplete dominance).
Phenotypes:
Red(TT)
Pink(Tt)
White(tt)
Phenotypic Ratio: Red 1: Pink 2: White 1 (Red=25%, Pink=50%, White=25%)
Genotypic Ratio: TT 1: Tt 2: tt 1 (TT=25%, Tt=50%, tt=25%)
Sex-Linked Traits
Definition: A trait shown by an allele that is located on the sex chromosome.
A sex-linked trait for the dumbo octopus could be hemophilia(inability to clot blood). A normal female's genotype would be X^BX^B(or X^BX^b if she was carrier) and a female affected by the disorder, her genotype would be X^bX^b. A healthy male's genotype would be X^BY and male with the disorder, his genotype would be X^bY.
The next punnett square shows a homozygous dominant male and a heterozygous female .
A sex-linked trait for the dumbo octopus could be hemophilia(inability to clot blood). A normal female's genotype would be X^BX^B(or X^BX^b if she was carrier) and a female affected by the disorder, her genotype would be X^bX^b. A healthy male's genotype would be X^BY and male with the disorder, his genotype would be X^bY.
The next punnett square shows a homozygous dominant male and a heterozygous female .
In this punnett square it shows their is a 50% chance that a female dumbo octopus will have the recessive trait but 0% of the females will actually be affected by hemophilia.