ARTH 207 Lecture Notes - Lecture 7: Precocial, Altricial, Yolk
12 Aug 2018
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Short life span, reproduce a lot so many eggs with low probability of survival, no parental care, often in smaller organisms like insects, sea stars, fish! Long life expectancy, few offspring but higher chances of survival, parental care, often in bigger animals like humans, mammals . Still developing from a sex cell so still considered as sexual reproduction but only one parent contributes (female) Different types, haploid and diploid that make haploid ind and diploid ind! Reproduction in fishes: low parental care since release so much eggs so r-selected. Benthic fish: larger eggs so more yolk, glues on things like vegetation or nests. More yolk means that they invest more energy to produce the eggs so sign that will have parental care in some. Unusual reproduction: hermaphrodite clownfish, amazon molly reproduce by parthenogenesis with no meiosis. Have a cloaca so no dick (except for some birds like ducks that have one) Lay eggs until she gets a full clutch.
