Tuesday, July 14, 2009

Imagine that beak color in a finch species is controlled by a single gene. You mate a finch homozygous for?

orange (pigmented) beak with a finch homozygous for ivory (unpigmented) beak and get numerous offspring, all of which have a pale, ivory-orange beak. This pattern of color expression is most likely to be an example of:





a. incomplete dominance.


b. polygenic inheritance.


c. pleiotropy.


d. crossing over.


e. codominance.

Imagine that beak color in a finch species is controlled by a single gene. You mate a finch homozygous for?
incomplete dominance results in a new phenotypic expression not seen before in the offspring think red plus white give you pink flowers. in co-dominance both alleles are expressed simultaneously...think red and white flowers give you red and white striped flowers. with your discription of ivory crossed wtih orange giving you a pale ivory -orange bill it is hard to assertain from the description of the bird's beak whether this is a case of co-domiance or incomplete domiance. it is not crossing over, pleitropy(where one gene affects many physical traits) nor polygenic inheritance (where many genes affect one physical trait)
Reply:A incomplete dominance ( heterozygous individuals have an intermediate, or in-between, phenotype).

survey research

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