Pedigree charts use shaded symbols to show organisms that have a particular trait, such as a defective gene, being traced in the chart. a breeder wants to make a pedigree chart of male horses to avoid breeding males that have a defective gene. what symbol would the horse breeder use to show a male who is affected by a defective gene?

a. shaded circle
b. shaded square
c. unshaded circle
d. unshaded square

B. shaded square

Explanation:

In pedigree analysis, squares represent the males while circles represent the female individuals. Since the horse breeder wants to show the male horse who is affected by the target gene, he should represent it with a shaded square. A shaded square in pedigree represents the affected males. Unshaded squares would represent the unaffected normal males.

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.