A group of 4 students want to design an experiment in an effort to support the hypothesis, “Sunlight is needed for the normal healthy growth of plants.” Each student presented a possible experiment. Student #1: Purchase 20 plants. Plant 10 of the plants in 3 cups of soil and place all of the cups in the sun. Take the other 10 plants and put them in 2 cups of soil, then place this group in the sun under a box. Observe and document changes. Student #2: Place 10 plants outside in the sunlight. Place the other 10 plants outside under a box. Plant both in the same amount of soil and provide all with the same amount of water. Document observations. Student #3: Place 20 plants in front of a window. Give all of the plants the same amount of water and the same type of soil. Observe plants for any changes. Student #4: Obtain two seeds. Place one seed outside and one on an inside window sill. Observe and document which seed sprouts the fastest. Which student provides the best reason for choosing his or her experiment to test the hypothesis?

In a hypothetical breed of dogs, coat color is controlled by two genes. there are six different coat colors in this breed: black, brown, cream, gray, silver, and tan. consider the following crosses. cross 1: black females from a lineage of all black dogs are crossed with brown males from a lineage of all brown dogs. f1 males and females are all black. when f1 are intercrossed, f2 males and females are black or brown. cross 2: black females from a lineage of all black dogs are crossed with tan males from a lineage where all males are tan and all females are cream. f1 males are black, f1 females are gray. when f1 are intercrossed, f2 males and females are black, brown, gray, or tan. cross 3: silver females from a lineage where all females are silver and all males are gray are crossed with brown males from a lineage of all brown dogs. f1 males and females are all gray. when f1 are intercrossed, f2 males are black, brown, gray, or tan, f2 females are cream, gray, silver, or tan. select the correct statements regarding the mode of inheritance of the coat color genes. a) both genes are x-linked. b) both genes are autosomal. c) one of the genes modifies the expression of the other gene. d) each gene has an additive effect on the intensity of coat color. e) each gene independently specifies three colors. f) one of the genes is autosomal, and the other is x-linked.

Creation of an unnaturally uniform sample to represent a diverse populationcan be avoided by: a. including only willing b. asking another scientist for .c. choosing only identical participants. d. selecting individuals at random.

Dna and rna share a number of similarities, but they also differ in certain aspects of their structure. wich nitrogenous base is found in rna but is not found in dna