← probability and heredity Export Options Alphabetize Word-Def Delimiter Tab Comma Custom Def-Word Delimiter New Line Semicolon Custom Data Copy and paste the text below. It is read-only. Select All Probability a number that describes how likely it is that an event will occur http://farm4.staticflickr.com/3258/3249920052_6d4a5b67f7.jpg Punnett square a chart that shows all the possible combinations of alleles that can result from a genetic cross http://farm5.staticflickr.com/4125/5173745389_48e2417e18.jpg Phenotype an organism's physical appearance, or visible traits http://farm4.staticflickr.com/3486/3876409804_c9bb6f3603.jpg Genotype an organism's genetic makeup, or allele combinations http://farm8.staticflickr.com/7056/6988175941_2ef6b20a81.jpg Homozygous having two identical alleles for a trait http://farm1.staticflickr.com/97/218649763_52f5e4ebfc.jpg Heterozygous having two different alleles for a trait http://farm6.staticflickr.com/5056/5538822258_878b5e13b0.jpg Codominance a condition in which neither of two alleles of a gene is dominant or recessive http://farm3.staticflickr.com/2476/3643298112_48831fb0d7.jpg