If nondisjunction takes place in a spermatocyte in the  first meiotic division and the sperm fertilizes a normal egg, the resulting infant may have

please help select and explain just the correct. Thanks!If nondisjunction takes place in a spermatocyte in the

first meiotic division and the sperm fertilizes a normal egg, the resulting infant may have

  • three copies of each chromosome
  • one copy of each chromosome
  • a normal number of chromosomes
  • three copies of chromosome 13,18 or 21
  • some cells have a normal chromosome number and other cells have three copies of each chromosome

Studies of aneuploidy of the sex chromosomes in spontaneous abortions reveal that

two copies of the Y chromosome are fatal

two copies of the X chromosome are necessary for survival

at least one X or one Y are necessary for survival

the X chromosome is not necessary for survival

the Y chromosome is not necessary for survival.

What is the phenotype of an individual with the genotype XXY?

female, with one Barr body

male, with two Barr bodies

female, with an inactivated Y chromosome

male, with one Barr body

male, with an inactivated Y chromosome

 
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