Freezing sperm since the 1970s has significantly prevented pregnancy problems. Frozen sperm as a result of freezing sperm practices in the last 50 years ago has significantly contributed to preventing pregnancy problems and has increased live birth rates.
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a stunning variety of organisms each striving to reproduce some of them don t even need a partner to produce offspring in others the father bears the young and it turns out that in sexual reproduction the conventional model of two genetic parents doesn t always hold true at least in plants. here moms have one genetic mother and one genetic father the same generally goes for the rest of the animal world but new research shows that things can be different for plants it turns out that fail cress plants occasionally exhibit different numbers of chromosomes. molecular biologist rita goes heart and her team at braman university suspected that they could have a mother and two fathers now the researchers have been able to prove it. either before during the federalization process an excel can infuse with more than one sperm cell. we describe this red process as poly spermy what s special about plants