[ 185 ] Life Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • With yellow (r) as a recessive allele in plants and red as a dominant (R), what would the percentage of each of the following types be based on the crossing of two heterozygous plants? ____% of the offspring would be homozygous yellow (rr) ____% of the offspring would be heterozygous red (Rr) ____% of the offspring would be homozygous red (RR) Radiocarbon decay 100.0 90.0 80.0 70.0 60.0 50.0 40.0 30.0 20.0 10.0 0.0 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 Amount of C14 remaining (%) Time (years) After 10,000 years ___% of the C14 sample remains.