Sex-linked Sex-influence Sex-limited traits

• What type of trait is baldness considered to be?

  Sex-influenced trait
• Why does the expression of baldness vary according to sex?

  Because its degree of expression varies based on sex
• In which sex is baldness more common?

  Males
• Who was Thomas Hunt Morgan?


  A geneticist and embryologist
• What organism did Thomas Hunt Morgan study to investigate eye color traits?

  Drosophila (fruit fly)
• What was the result of Morgan's experiment with the white-eyed male and red-eyed female Drosophila?

  All offspring in the F1 generation had red eyes
• What conclusion did Morgan draw about genes and traits related to sex chromosomes?

  Some genes and traits are located in the sex chromosomes, specifically in the X chromosome
• Why does the X chromosome contain more genes than the Y chromosome?

  Because the X chromosome is longer
• What is the significance of the length of the X chromosome in relation to gene content?

  The X chromosome contains many more genes compared to the Y chromosome