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sexual selection

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11 Terms

1

sexual selection

selection for traits that improve mating success

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2

intrasexual selection

  • selection within a sex

  • male competition for the right to mate with a female

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3

intersexual selection

  • mate choice

  • females choose the male they want to mate with

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4

sexual dimorphism

  • difference in appearance of males and females

  • males look better so females will mate with them

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5

quantitative character

characters that vary along a continuum

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6

discrete character

  • come in 2 forms

  • not helpful for natural selection

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7

mutation

  • random changes in dna

  • affect mostly populations with with short generational spans (ex. bacteria)

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8

sexual recombination

sex shuffles alleles and deals them at random to offspring

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9

diploidy

  • two copies of each gene, one inherited from each parent (AA, Aa, aa)

  • hides genetic variation in the form of recessive alleles that can skip a generation

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10

heterozygotes

one recessive and one dominant gene (Aa)

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11

balanced polymorphism

  • gives heterozygotes an advantage

  • how natural selection maintains diversity

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