One species of ape has 48 chromosomes. In a female, nondisjunction occurs and one of her eggs is produced with 25 chromosomes instead of 24. When is the formation of an extra chromosome in a gamete most likely to occur?

Where are mature sperm stored?

A student is looking through his light microscope (100x magnification) at a slide of a stained onion root tip to identify cells that are undergoing mitosis. What phase of mitosis is the cell that is surrounded by a black border (as indicated by the black arrow)?  This phase is characterized by a cell plate, chromosomes that are relaxing and uncoiling, and a reforming nuclear envelope.  

Which of the following gametes is correctly paired with its supporting structure? 

If there are 20 chromosomes in a cell at prophase, how many chromosomes are there in each daughter cell produced by mitosis?

If the DNA of a certain organism has guanine as 30% of its bases, then what percentage of its bases are adenine?

Sulfur Dichloride: Valence and Lewis Structure Which of the following Lewis structures best represents sulfur dichloride (SCl2)?

A basic solution such as barium hydroxide, Ba(OH)2,

Which is the balanced net ionic equation for the reaction between Ni(NO3)2 (aq) and NaOH (aq)?

A lime juice has a hydronium ion concentration of 1.45 x 10-4 mol/L. What is pH of the lime juice?