sex determination

• What is the term used to describe the process of determining sex in humans?

  Sex determination
• What chromosomes do females have for sex determination?

  Two X chromosomes (XX)
• What chromosomes do males have for sex determination?


  One X and one Y chromosome (XY)
• How does a genetic cross illustrate sex inheritance?

  • Each parent contributes one chromosome from their sex chromosome pair.
  • The mother always contributes an X chromosome.
  • The father can contribute either an X or a Y chromosome.
• What does a Punnett square help predict in sex inheritance?


  It predicts the offspring’s sex based on parental contributions.
• What is the outcome for the offspring if both parents contribute an X chromosome?

  XX (Female)
• What is the outcome for the offspring if the mother contributes an X chromosome and the father contributes a Y chromosome?


  XY (Male)
• What are the probabilities of offspring being male or female based on the genetic cross?


  • 50% chance of being female (XX)
  • 50% chance of being male (XY)
• What is the ratio of females to males in sex determination?


  The ratio is 1:1 or 50:50.
• What does the simple genetic cross illustrate about sex inheritance in humans?


  • It shows the direct proportion of male to female offspring.
  • It demonstrates the probability of sex inheritance.