Answered: ultry breed, chickens can have black,…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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In a poultry breed, chickens can have black, blue or white feathers. The different feather colors are determined by interactions between genes at two loci. One locus determines the type of pigment produced by the skin cells: a dominant allele B encodes black pigment, whereas a recessive allele b encodes blue pigment. Alleles at a second locus affect the deposition of the pigment onto the feathers. Allele E allows dark pigment (black or blue) to be deposited, whereas the homozygous recessive (ee) condition prevents the deposition of dark pigment, causing the feathers to be white. In each of the following 3 crosses give the genotypes and phenotypes of the parents and their offspring: a) Two black birds that are both heterozygous for traits B and E b) Two blue birds that produce 6 blue and 2 white chicks c) A black bird that is homozygous dominant for both traits and a white bird that is homozygous recessive for both traits

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