3.2.3 Sex Determination

• What is the karyotype notation for females in humans?

  XX
• Males have one X and one Y chromosome
• Match the chromosome combination with the corresponding sex:

  XX ↔️ Female

  XY ↔️ Male
• Males have one X and one Y chromosome
• The karyotype notation for females is XX
• Females have two X chromosomes.


  True
• What is sex determination in biology?

  Determining male or female
• Males in humans have the karyotype notation XY.


  True
• The Y chromosome is the key factor in determining maleness.

  True
• Sex determination explains how genotype influences phenotype in humans.


  True
• The SRY gene on the Y chromosome initiates male development.


  True
• Males have one X and one Y chromosome in their karyotype.


  True
• Males have one X and one Y chromosome.
• What is karyotype notation used for in sex determination?

  Chromosome combination
• When does sex determination occur during fertilization?

  Egg is fertilized
• Match the sex determination system with its key feature:

  XX/XY ↔️ Y chromosome determines maleness

  XX/XO ↔️ One X chromosome determines maleness
• The SRY gene on the Y chromosome initiates the development of male characteristics.
• The karyotype notation XY represents a male.


  True
• A male's karyotype includes one X and one Y chromosome.
• An egg always contains an X chromosome.


  True
• Match the sex determination system with the chromosome that determines sex:

  XX/XY ↔️ Y chromosome

  XX/XO ↔️ Single X chromosome

  ZZ/ZW ↔️ W chromosome
• Y-linked traits are only passed down from father to son.
• The SRY gene is located on the Y chromosome.
• Females have two X chromosomes, denoted as XX in their karyotype.


  True
• What is the sex determination system in insects called?

  XX/XO
• What is the biological mechanism that determines whether an organism develops as male or female?

  Sex determination
• Which gene on the Y chromosome is crucial for maleness?

  SRY gene
• A female has two X chromosomes in her karyotype.

  True
• Steps in human sex determination at fertilization

  1️⃣ Egg (X) combines with sperm

  2️⃣ Sperm carries either X or Y chromosome

  3️⃣ X sperm + X egg = XX (Female)

  4️⃣ Y sperm + X egg = XY (Male)
• Humans use the XX/XY sex determination system.

  True
• X-linked traits are more commonly expressed in males because they have only one X chromosome.

  True
• Females with Turner syndrome may experience ovarian dysfunction.
• In humans, sex determination is controlled by sex chromosomes
• How many X chromosomes do females have?

  Two
• What is the SRY gene on the Y chromosome responsible for?

  Male characteristics
• Which sex chromosome do females have two of?

  X
• What does karyotype notation represent in sex determination?

  Sex chromosome combinations
• What controls sex determination in humans?

  Sex chromosomes
• Which gene on the Y chromosome initiates male development?

  SRY gene
• Match the karyotype notation with the corresponding sex:

  XX ↔️ Female

  XY ↔️ Male