Answer to Question #149232 in Genetics for Kate

Question

10. In Whos (i.e. inhabitants of Whoville), matings between curly haired individuals and spikey haired individuals produce offspring with a mixture of both curly hairs and spikey hairs. Matings between individuals with a mixture of curly and spikey hairs produce offspring in a ratio of 1 curly: 1 spikey: 2 curly and spikey. Is this an example of incomplete dominance or codominance?

11. Gene H controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, H, have sharp spines, whereas homozygous recessive hh cactuses have dull spines. At the same time, a second gene, N, determines whether cactuses have spines; homozygous recessive nn cactuses have no spines at all. What is the predicted phenotypic ratio for a cross between a doubly heterozygous cactus (HhNn) and a spineless cactus whose parents both had dull spines?

Answer 1

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