A breed of chicken displays codominance in their feather colors. Allele b gives black feathers and allele w gives white feathers. Two erminette chickens (bw) were crossed. What is the genotypic and phenotypic ratios for their offspring?.

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In the image, layer a is the topmost layer. layer c contains fossils from the precambrian era. layer b contains dinosaur fossils, and layer a contains fossils of mammals. which two statements are supported by this evidence? 1. mammals lived before the precambrian era. 2. dinosaurs and mammals existed in the precambrian era. 3. dinosaurs evolved after precambrian organisms. 4. precambrian organisms evolved after dinosaurs. 5. precambrian organisms were the first life-forms to become fossilized, according to this sample.