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Animal Behavior Sex
Sex
18
Biology
Undergraduate 4
03/29/2010

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Cards

Term
Sex
Definition
Genetic Recombination
Term
Costs of Sex (3)
Definition
Cost of males
Cost of meiosis
Cost of mating
Term
Cost of Meiosis
Definition
Break-up of favorable gene complexes
Some organisms are facultatively asexual
Term
Costs of Sexual Reproducation
Definition
Time and effort spent in mating
Exposure to disease and predators
Term
Benefit of Sex
Definition
Novel gene combinations via recombination. Can weed out mutations.
Term
Sex Determination
Definition
Influences the degree to which a female can alter the sex ratio of her offspring
Term
3 Types of Sex Determination
Definition
Chromosomal
Environmental
Social
Term
Heterogamety
Definition
Sex with heterozygous alleles for sex determine sex of offspring.
Term
Haplodiploidy
Definition
Haploid males develop from unfertilized eggs. Diploid females develop from fertilized eggs.
Term
Environmental Sex Determination
Definition
Incubation Temperature
Term
Social Sex Determination
Definition
Depending on mating system, might be able to change sex.
Term
Fisher
Definition
Parental strategies should evolve towards equal investment in offspring of the two sexes
Term
Trivers-Willard Effect
Definition
Maternal condition influences offspring investment.
Term
Females in good condition do (3 things)
Definition
transfer competitive ability to sons more than daughters (e.g. through parental care)
have more offspring
produce more sons than daughters assuming that
Term
Females in poor condition will produce
Definition
More daughters than sons.
Term
Local Mate Competition
Definition
Male siblings fight with each other for mates.
Term
Local resource competition
Definition
Offspring that stay near their birth site may compete with their parents for resources
Term
Local resource enhancement
Definition
Offspring of one sex delay disperal and remain at the natal site to help parents raise their siblings.
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