Sexual dimorphisms
from class:
General Biology I
Definition
Sexual dimorphisms are differences in appearance between males and females of the same species, beyond the differences in their sexual organs. These differences can include size, color, shape, and structure.
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5 Must Know Facts For Your Next Test
- Sexual dimorphisms often arise due to sexual selection pressures.
- They can result from either intersexual selection (mate choice) or intrasexual selection (competition among the same sex).
- Examples include the larger antlers of male deer compared to females and the brighter plumage of male birds.
- Sexual dimorphisms can influence an individual's reproductive success by affecting mate attraction or rivalry.
- These traits may also come with trade-offs, such as increased visibility to predators.
Review Questions
- What are some common examples of sexual dimorphism in animals?
- How do sexual dimorphisms typically arise within a population?
- What are the potential trade-offs associated with sexual dimorphisms?
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