In some chickens, the gene for feather color is controlled by codominance. The allele for black feathers is B and the allele for white feathers is W. The heterozygous phenotype (physical trait or color that results from these two parents) is called erminette. What is the genotype for chickens with black feathers?A) BbB) BBC) WWD) WB

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.