Some organisms have abnormal sex chromosomes such as X (only have one X chromosome) or XXY (extra X chromosome).

What is the most likely cause of the abnormal sex chromosome?

Choose 1

(Choice A)
A
Nondisjunction occurred during meiosis

(Choice B)
B
An error occurred in mitosis of the fertilized egg

(Choice C)
C
Sex chromosomes in gametes are lost during fertilization

(Choice D)
D
A normal egg was fertilized by a haploid sperm

What was dr. willem johan kolff’s first step in using the scientific process to invent the hemodialysis machine? he built the machine and tried it with various patients, collecting data about its effectiveness. when a patient’s kidneys failed, he wondered if it would be possible to perform kidney functions with an external machine. he researched and collected data about numerous patients who exhibited symptoms of kidney failure. he drew conclusions from studies of various symptoms of kidney failure, and drew a design for the ideal external blood-processing machine.

9. the history of life on earth is recorded in

Adistinctive characteristic of mammals that is not observed in other vertebrates is