In fruit flies, normal wing length, n, is dominant to apterous (no wings), n. also, red eyes, r, are dominant to sepia eyes, r. a particular fruit fly has normal wings and red eyes, but since these are the dominant traits, it is not possible to tell whether this fly is homozygous or heterozygous for these traits simply by looking at it. one way to find out is to perform a test cross. which phenotype represents a fly that should be used in this test cross? a. apterous with red eyes b. apterous with sepia eyes c. normal wings and red eyes d. normal wings and sepia eyes

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

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the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

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