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Sex Determination Homework Help

A sex-determination system determines the sexual characteristics of an organism. Normally there are two sexes present in the organisms with few exceptions.

  • XX/XY sex-determination system - This is found in human beings. In this system, females have two sex chromosome of same kind (XX) so it makes one type of gametes while males have two different sex chromosomes (XY) so it makes two types of gametes.
  • XX/X0 sex determination- This type of system is found in grasshopper. In this females have two copies of the same type of sex chromosome (XX) but males have only one (X0). In this male and female makes only one type of gametes.
  • ZW sex-determination system – This is found in birds, reptiles, and some insects. The ZW sex-determination system is reversed if we compare it to the XY system: In this females have two different kinds of chromosomes (ZW) and make two types of gametes while males have two of the same kind of chromosomes (ZZ) and makes only one kind of gametes.

Sex Determination

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