Biology Question!?

A cross between two phenotypically identical indivisuals results in 2/3 of the progeny resembling the parents, and 1/3 with a different phenotype. Which of the following best explains these results?





A-Incomplete Dominance


B-Epistasis


C-Dominant lethal


D-Reccesive lethal


E-Polygenic inheritance

Biology Question!?
none of those. Incomplete dominance would yield 1/4 for phenotype that represents the dominant gene, 1/2 whatever the heterozygous condition would be, and 1/4 the phenotype that represents the recessive condition.





Epistasis is when an allele can influence genes at a different location. Albinism is the classic example.





Dominant lethal means if you have the dominant gene - you have the lethal disorder. Huntington's is an example of this.





Recessive lethal means that you have to inherit a recessive from each parent and the combination is lethal.





Polygenic inheritance just means that there are many genes that influence a given trait. Skin colour or hair colour are polygenic.
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