Bio lecture notes 1

Bio lecture notes 1 - -Sterile castes-Reproductive division...

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February 28, 2008 Eusociality (adj.): Animals that show an advanced level of social organization , in which a single female or caste produces the offspring and a sterile caste help raise the young. Caste (n.): a physically distinct group of individuals who carry out a specific function. Eusociality - A reproductive division of labor” exists. - Happens in some insect species - Orders Hymenoptera and Isoptera - Eusocial insects have a sterile caste - Why? What is the advantage to not reproducing? - Because individuals are very closely related in eusocial species. In hymenoptera- Males- haploid (n)- from unfertilized eggs Females- diploid (n)- from fertilized eggs Result- - Sisters are 75 percent related toe ach other - Related to own offspring by just 50 percent Forgoing reproduction to help a sister raise her young becomes advantageous Termites - Dilpoid, but inbreeding within termite mounds - Results in individuals being more closely-related to siblings than own offspring
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Unformatted text preview: -Sterile castes-Reproductive division of labor. Video: Castles of Clay Questions to be thinking about during the video.-Why are termite mounds so large and complex?-Why do the mounds exist at all?-What do termites contribute to the ecosystem in terms of energy flow and efficiency?-What is the role of the “saliva passing? A mixture of chemicals determines the exact necessities of the termites.-What is the purpose of the “hanging gardens”? texture and smell of damp ??? that have mushrooms that can be digested by termites.-Name three principle predators. Jackal, mongoose, and a 5 foot long lizard. -What are “alates”? What are their functions?-Why do Kenyan people value and claim ownership of the mounds? Valuable source of protein to people. http://grad.bio.uci.edu/ecoevo/slockton/eusociality.pdf...
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