<transcript><audio_57>zygote survival because the Total Resource One individual can invest in reproduction is assumed to be fixed the first formal mathematical Theory proposed to explain the evolution of anisogamy was based on gam limitation</transcript><transcript><audio_58>this model assumed that natural selection would lead to gamei sizes that result in the largest population-wide number of successful fertilizations if it is assumed that a certain amount of resources provided by the gametes are needed for the survival of the resulting</transcript><transcript><audio_59>zygote and that there is a trade-off between the size and number of gametes then this Optimum was shown to be one where both small male and large female gamt are produced however these early models assume that natural selection</transcript><transcript><audio_60>acts mainly at the population level something that is today known to be a very problematic assumption the first mathematical model to explain the evolution of anisogamy via individual level selection and one that became widely accepted was the theory of gamor</transcript><transcript><audio_61>sperm competition here selection happens at the individual level those individuals that produce more but smaller gametes also gain a large ler proportion of fertilization simply because they produce a larger number of gametes that seek out those of the</transcript><transcript><audio_62>larger type however because zygotes formed from larger gametes have better survival prospects this process can again lead to the Divergence of gamt sizes into large and small female and male gametes the end result is one where</transcript> zygote survival because the Total Resource One individual can invest in reproduction is assumed to be fixed the first formal mathematical Theory proposed to explain the evolution of anisogamy was based on gam limitation this model assumed that natural selection would lead to gamei sizes that result in the largest population-wide number of successful fertilizations if it is assumed that a certain amount of resources provided by the gametes are needed for the survival of the resulting zygote and that there is a trade-off between the size and number of gametes then this Optimum was shown to be one where both small male and large female gamt are produced however these early models assume that natural selection acts mainly at the population level something that is today known to be a very problematic assumption the first mathematical model to explain the evolution of anisogamy via individual level selection and one that became widely accepted was the theory of gamor sperm competition here selection happens at the individual level those individuals that produce more but smaller gametes also gain a large ler proportion of fertilization simply because they produce a larger number of gametes that seek out those of the larger type however because zygotes formed from larger gametes have better survival prospects this process can again lead to the Divergence of gamt sizes into large and small female and male gametes the end result is one where
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