telling sex from seed????

well I was told that u could look at the bottom of the seed and tell if it was a male or female or atleast have a better chance of it being a female. Is this true???? I would love to know this and try to find out what strain I have...Here are some pics...so let me know what you think the strain is on these little ones....

is basically impossible to guess what strain it is, looks more indica keep it up

lowryder One Or 2

never heard of it (lowrider) what is it? and is there any pics of it? I was told it was white widow and skunk. But if not and it is, is it any good???

If you look at the bottom portion of your seed, and see a concave depression, what you are looking at has a 90% chance of being a female seed. If the seed does not exhibit this depression it is male. If you roll your seed on the table and it wobbles like a football, it be male. Rolls smoothly, female. Is all i have. I did see something put out my HighTimes that said the same thing. Havent actually tested it yet tho.
Nim

lowrider is an auto-flowering strain. Usually from seed to harvest 60 days

is it worth keeping? quality wise and does it produce a large crop like some of the name brand strains? I am using 400 hps 3 gallon pots with miricle grow soil? I should have cloned my lavender when I had the chance!!!!