If a male with klinefelter syndrome undergoes spermatogenesis (without nondisjunction), how many chromosomes would be present in the sperm? select all that apply.

What must happen before meiosis can begin? a. four gametes must be produced b. the four tetrads must be pulled apart c. dna doubles and produces sister chromatids d. the cell membrane pinches together

In dna, only the_ varies from one nucleotide to another. base phosphate sugar amino acid

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.