Study Unit 3: Sex Determination And Sex-linked Characteristics an der University Of Pretoria | Karteikarten & Zusammenfassungen

Lernmaterialien für Study unit 3: Sex determination and sex-linked characteristics an der University of Pretoria

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SRY gene

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  • Male determining gene in humans
  • Found on Y chromosome
  • Encodes protein namely transcription factor, which binds to DNA and stimulates transcription of genes that promote differentiation of testes.
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Hemizygous

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  • Possesses only 1 loci
  • Male hemizygous for X-linked loci


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ZZ-ZW sex determination

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  • Birds, some reptiles, butterflies, some amphibians, some fish
  • Females: ZW (heterogametic)
  • Males: ZZ (homogametic)
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Role of sex chromosomes

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  • X - genetic info for both sexes

             - at least 1 necessary for human development

  • Y - has male determining gene

             - even a single copy produces a male phenotype

             - absence = female phenotype

  • Fertility - based on genes on X and  Y chromosomes                                                                                           - female needs at least 2 copies
  • Extra X - upsets normal development                                                                                                                     - physical problems, intellectual disabilities
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Androgen-insensitivity syndrome

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  • Females
  • External - female sexual characteristics
  • Internal - male sexual characteristics
  • Vagina ends blindly
  • Cells contain X and Y chromosome
  • X-linked
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Sex-linked characteristics

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Characteristics determined by genes located on sex chromosomes

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Autosomes

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Nonsex chromosomes, same in males and females

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​Monoecious

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Organism bear both male and female reproductive structures

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Homogametic sex

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Sex to produce gametes that are all the same based on their sex chromosomes

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Environmental sex determination

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  • Some invertebrates, turtles, alligators
  • Sex determined by environmental factors, like temperature
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Pseudoautosomal regions

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Region on sex chromosomes where they are homologous (carry same genes on these regions)

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Non-disjunction

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Chromosomes doesn't separate during anaphase I

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Beispielhafte Karteikarten für deinen Study unit 3: Sex determination and sex-linked characteristics Kurs an der University of Pretoria - von Kommilitonen auf StudySmarter erstellt!

Q:

SRY gene

A:
  • Male determining gene in humans
  • Found on Y chromosome
  • Encodes protein namely transcription factor, which binds to DNA and stimulates transcription of genes that promote differentiation of testes.
Q:

Hemizygous

A:
  • Possesses only 1 loci
  • Male hemizygous for X-linked loci


Q:

ZZ-ZW sex determination

A:
  • Birds, some reptiles, butterflies, some amphibians, some fish
  • Females: ZW (heterogametic)
  • Males: ZZ (homogametic)
Q:

Role of sex chromosomes

A:
  • X - genetic info for both sexes

             - at least 1 necessary for human development

  • Y - has male determining gene

             - even a single copy produces a male phenotype

             - absence = female phenotype

  • Fertility - based on genes on X and  Y chromosomes                                                                                           - female needs at least 2 copies
  • Extra X - upsets normal development                                                                                                                     - physical problems, intellectual disabilities
Q:

Androgen-insensitivity syndrome

A:
  • Females
  • External - female sexual characteristics
  • Internal - male sexual characteristics
  • Vagina ends blindly
  • Cells contain X and Y chromosome
  • X-linked
Mehr Karteikarten anzeigen
Q:

Sex-linked characteristics

A:

Characteristics determined by genes located on sex chromosomes

Q:

Autosomes

A:

Nonsex chromosomes, same in males and females

Q:

​Monoecious

A:

Organism bear both male and female reproductive structures

Q:

Homogametic sex

A:

Sex to produce gametes that are all the same based on their sex chromosomes

Q:

Environmental sex determination

A:
  • Some invertebrates, turtles, alligators
  • Sex determined by environmental factors, like temperature
Q:

Pseudoautosomal regions

A:

Region on sex chromosomes where they are homologous (carry same genes on these regions)

Q:

Non-disjunction

A:

Chromosomes doesn't separate during anaphase I

Study unit 3: Sex determination and sex-linked characteristics

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