[ 363 ] Life Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • The letters shown here show the genotypes of two parents. Yy × Yy The Punnett square shows the possible combinations of parent alleles. Write the remaining correct combination of the parent alleles in the empty box. Y y Y y YY Yy Yy Probability is an important skill for figuring out answers to GED Science questions. This is an example of a probability question. Five parts of the human body and two diseases are written on scraps of paper and placed into a hat. What is the probability of picking a disease out of the hat? Judy measured the heights of several seedlings that she used in a control group of an experiment. The heights in cm were: 9.9, 10.2, 10.6, 9.3, 10.2, 10.2, 10.0. What is the mean?