A(n) ________ group is treated like an experimental group, except for the one variable being tested
Fill in the blank(s) with correct word
control
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Ferns occupy diverse habitats and have unique adaptations. Which of the following statements regarding fern adaptations is not true?
A. Tiny aquatic ferns, such as Salvinia, float on the surface of the water. B. Epiphytic ferns, such as staghorn ferns, often produce two leaf types, one for photosynthesis and spore production and the other to form a pocket that collects organic matter. C. Azolla is a tiny aquatic fern that has been used for centuries as a biofertilizer of rice. D. Unlike many other groups of plants, ferns have not been found to have symbiotic associations with nitrogen-fixing bacteria. E. Approximately 40% of living ferns are epiphytes.
Some dogs have erect ears; others have drooping
ears. Some dogs bark when following a scent; others are silent. Erect ears and barking are due to dominant alleles located on different chromosomes. A dog homozygous for both dominant traits is mated to a droopy-eared, silent follower. The expected phenotypic ratio in the F1 generation is a. 9:3:3:1. b. 100 percent of one phenotype. c. 1:1. d. 1:2:1. e. none of these.
In cystic fibrosis, two unaffected carriers can have a child with the disease. It is as common in boys as in girls. This disease is Select one:
a. X-linked dominant. b. X-linked recessive. c. autosomal recessive. d. pleiotropic. e. autosomal dominant.
In the United States, oral contraceptives are the most common means of birth control. Indicate whether the statement is true or false