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BIO 100 Exam 4 2025 Questions and Answers Which of the following describes the human ABO blood group system? ....ANSWER ...-Multiple alleles Gene S controls the sharpness of cactus spines. SS and Ss cactuses have sharp spines while ss cactuses have dull spines. At the same time, a second gene, N, determines whether cacti have spines or not. nn cacti have no spines at all. What is the expected result of a cross between a true-breeding sharp-spined cactus and a spinless cactus? ....ANSWER ...-All sharp-pined cacti offspring. A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring all with purple-flowers. This demonstrates... ....ANSWER ...-simple dominance. A woman with blood type A positive has a daughter who is type O positive and a son who is type B negative. Rh positive (R) is a trait that shows simple dominance over Rh negative (r). Which of the following is a possible partial genotype for the son? ....ANSWER ...-IBi Hydrangea plants of the same genotype are planted in a large garden. Some of the plants produce blue flowers and other produce pink flowers. This can be best explained by which of the following statements? - ....ANSWER ...-Environmental factors such as soil pH affect flower color. …FOR STUDENTS ONLY…©️2025 ALL RIGHTS RESERVED… 1