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BIOSC-101 Lecture Notes - Lecture 27: Asexual Reproduction, Sex Organ, Accelerated Evolution

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School
Diablo Valley College
Department
Biological Science
Course
BIOSC-101
Professor
wyler

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Document Summary

There is a two-fold fitness cost to producing sons. 2 forms (sexual and asexual) are identical except for their methods of. Only half of the genes are used to make offspring reproduction. Females are limited to a fixed number of offspring, whether the children are male/female. Solitary female raises the same number of offspring as a female who is with a male. Asexual females are pretending to be sexual, but only have daughters. Won"t work for bird and fish species that are clones of their mothers. The issue is the number of copies of her genes that a female gets to the next generation. Sexual species: each reproductive act involves a genetic contribution from a mother and father. Asexual species: each reproductive at involves a mother only. Assume sexual females produce equal numbers of sons and daughters, but that. Sexual mothers have half as many daughters as asexual daughters, which asexual mothers have daughters only increases by each generation.

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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 “two-fold cost of sexual reproduction.” 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.

Just to keep you in practice, a couple of the much beloved multiple multiple choice…

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 hemoglogin’s 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 “two-fold cost of sexual reproduction.” 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.