Table 1.

Frequency of the different genotypes in day-3.5 preimplantation embryos of +/− × +/− matings

Developmental stage	No. of embryos (% of total) with genotype
	Total	+/+	+/−	−/−	No result
Blastocyst	30  (60%)	15  (88%)	13  (72%)	2  (20%)	0
Morula	5  (10%)	1  (6%)	2  (11%)	2  (20%)	0
Degenerate morula	8  (16%)	1  (6%)	3  (17%)	3  (30%)	1
≤16 cells	7  (14%)	0	0	3  (30%)	4
Total	50	17	18	10	5