Table 2. F2 offspring genotypes produced by heterozygous F1 males mated to F1 females.

F1 Parents			F2 Offspring
Male	Male Genotype	Female Genotype	AA	Aa	Aa	Total
4-1M2	Aa	aa	−	9	0	9
4-1M4	Aa	aa	−	13	0	13
4-3M5	Aa	AA	10	0	−	10
5-2M1	Aa	AA	6	0	−	6
5-2M4	Aa	Aa	5	6	0	11
6-2M1	Aa	aa	−	0	10	10
8-1M2	Aa	AA	14	0	−	14
9-1M1	Aa	AA	10	0	−	10
12-2M5	Aa	Aa	0	3	7	10
12-2M9	Aa	Aa	0	7	8	15
14-3M6	Aa	Aa	0	1	6	7

Each male parent received the allele in boldface type from his mother and the underlined one from his father. Dashes indicate offspring genotypes not expected to be present under standard diploid Mendelian inheritance. In every case, the male only transmitted the allele he inherited from his mother to offspring. (Note that cross 6-2 is not included in Table 1 as all offspring from this cross were expected to be heterozygous—parents were AA*aa).