BIO120H1 Lecture 17: Lecture 17 Notes

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BIO120H1 Full Course Notes

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Costs and benefits of reproducing: inbreeding and outbreeding. Reproductive modes examples: daphnia, reproduces sexually in warmer water, reproduces asexually in cooler water, water hyacinth, worlds worst water weed, reproduces through sexual and clonal reproduction. Twofold cost of meiosis: number of gene copies: more individuals produced by asexuals, genes spread faster by females because of cost of producing males, transmission bias favours asexual. Sex brings together favourable mutations; asexuality takes longer: relatively few winners in the environment; each individual replaces itself- high mortality levels; lottery- www. notesolution. com, spatially hetero environments tangled bank: Sex is adaptive: temporally hetero environments: red queen. Fisher and muller: first to say sex brings together favourable mutations: example: heterogenous genotypes most favourable, abc is the fittest genotype. In experiment with rotifer: two different homogenous environements; condition with combo of both environments, let rotifer evolve, sex remained at high level at combo environment, asexual reopduction dominated in homogenous. Asexuality is sporatically distributed: many perennial plants reproduce asexually.

Related Questions

there could be more than one answer or no answer at all

1. _____ Females that reproduce sexually versus asexually are said to incur a âtwo-fold cost of sexual reproduction.â Which of the following costs are associated with sexual reproduction for females?

A) MALES! That do-nothing lot really does not directly contribute offspring to the next generation. Females would be better off making all daughters.

B) FEMALES! In most natural settings, those daughters compete with their mothers for potential mates and resources needed to successfully reproduce.

C) MITOSIS! Since sexual reproduction can produce many more offspring than asexual reproduction, there are energetic costs associated with the mitotic divisions required to produce those offspring.

D) MEIOSIS! Every time a gamete is produced, the parent loses a little bit of itself. Half to be precise since only half of its genes are passed on to sexually produced offspring.

E) DIVERSITY! Mothers maximize fitness if all offspring are genetically just like them. Sexual reproduction causes genetic diversity, which ultimately lowers the fitness of both parents.

Contrast asexual and sexual reproduction and explain the advantages of each. Provide at least two examples of organisms that use each type of reproduction.

Just to keep you in practice, a couple of the much beloved multiple multiple choiceâ¦

1. An increase in CO₂ levels in the blood directly or indirectly causes which of the following?

A) an increases in ventilation rate

B) a decrease in the pH

C) a decrease in hemogloginâs binding affinity for O₂

D) a decrease in the O₂ levels in the blood

E) an immediate increase in the number of red blood cells found in the blood stream

2. _____ Females that reproduce sexually versus asexually are said to incur a âtwo-fold cost of sexual reproduction.â Which of the following costs are associated with sexual reproduction for females?

A) MALES! That do-nothing lot really does not directly contribute offspring to the next generation. Females would be better off making all daughters.

B) FEMALES! In most natural settings, those daughters compete with their mothers for potential mates and resources needed to successfully reproduce.

C) MITOSIS! Since sexual reproduction can produce many more offspring than asexual reproduction, there are energetic costs associated with the mitotic divisions required to produce those offspring.

D) MEIOSIS! Every time a gamete is produced, the parent loses a little bit of itself. Half to be precise since only half of its genes are passed on to sexually produced offspring.

E) DIVERSITY! Mothers maximize fitness if all offspring are genetically just like them. Sexual reproduction causes genetic diversity, which ultimately lowers the fitness of both parents.

BIO120H1 Lecture 17: Lecture 17 Notes

BIO120H1 Full Course Notes

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