Answers

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Across
  1. 2. chromosomes Chromosomes are packages of DNA formed in eukaryotes to organize the genetic information.
  2. 3. After a female egg is fertilized, the resulting one-celled organism becomes known as a zygote.
  3. 7. when twins are joined at some part of the body
Down
  1. 1. when twins look the same
  2. 4. XX chromosomes.
  3. 5. when siblings are born at the same time
  4. 6. XY chromosomes