A scientist is examining a pedigree that includes several generations of an organism with XX/XY chromosome sex determination. Which patter of inheritance would support the hypothesis that the trait being studied is a recessive sex- linked trait found on the X chromosome? a. The trait is only expressed in males who have a father with the trait. b. The trait is expressed in half of the female organisms and all of the male organisms. c. The trait is mostly expressed in males who have a maternal grandfather with the trait. d. The trait is mostly expressed in females who a paternal grandmother with the trait.

The patter of inheritance would support the hypothesis that the trait being studied is a recessive sex- linked trait found on the X chromosome "The trait is mostly expressed in males who have a maternal grandfather with the trait."

Explanation:

A pedigree chart is a illustration that displays the existence and arrival of phenotypes of a specific genetic factor or organism and its families from one group to the next, most usually individuals, show dogs, and race horses. A pedigree chart displays a family tree, and shows the members of the family who are affected by a genetic trait. This chart shows four generations of a family with four individuals who are affected by a form of colorblindness. Circles represent females and squares represent males.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms