Exam 2 - MONOGAMY Sterile offspring= two species are not...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
MONOGAMY Sterile males decrease in population only when monogamy. Monogamous bird fathered by extra pair male. Social Monogamy =pair lives works together but not faithful Sexual monogamy = pair raise young and only copulate with each other Mating pairs share genetic information and possible help in child- rearing Child rearing is most commonly done by the female. Provides milk. Sperm competition—sperms survive for several days in reproduction tract. Ovary ovulated oocyte fertilization 2cell stage oviduct (fallopian tube) 4 cell stage 8 cell stage morula implantation of blastocyte Last male advantage-to ensure fatherhood males mate and produce copious quantities of sperm Sperm from the second male displaces the sperm from the first male. Non monogamous animals have higher chance of successfully giving birth (100%) Mating pairs may be genetically incompatible o Incompatible=greater genetic diversity o Compatible=less due to self fertilization Females may choose traits like large displays that are disadvantageous for male survival Females prefer males with mates Purple Martins After successfully mating, male martins call younger males, and then cuckold the young male’s females Reductive success=evolutionary success EVOLUTION: WHAT IS IT? DNA Transcription mRNA translation protein Genes code for proteins (or RNA). These gene products give rise to traits As Organisms reproduce, the DNA is passed on to the next generation o DNA replicated semi-conservatively o Mutations occur <ex. Sickle cell anemia> DNA must be replicated before it can be passed How it is passed on and how it gets modified impacts evolution Different sequences in amino acid lead to differences in 3D shape and different functionalities DNA changes=Traits changes Evolution= a species’ genetic component changes as the individuals reproduce. Changes are based on how the DNA changes and who reproduces Mutation replicate population of evolved traits Natural selection—individuals that are most successful at reproducing will pass on more of their genetic information MEMES=transmissible ideas o Ideas can act similarly to genes o Contain info o Replicate with imperfect fidelity Evolve-most successful replicators become most abundant Genes Memes Slow replication Rapid replication High copy fidelity Low copy fidelity Universal in organisms Limited to some organisms Humans can pass on genes and/or memes (oddly) Genetic drift aka sampling error EVOLUTION: WHO WHAT HOW? Evolution: changes to groups not individuals Species evolve via changes in DNA during reproduction/ individuals are selected and cannot be evolved Species evolve o A population that can produce fertile offspring o A population that does reproduce o A population sharing genetic information Sterile offspring= two species are not the same
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 06/16/2009 for the course BIO 53665 taught by Professor Iverson during the Spring '07 term at University of Texas at Austin.

Page1 / 3

Exam 2 - MONOGAMY Sterile offspring= two species are not...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online