Viruses and Chromosomes (SI)

An organism's reproductive cells, sperm and egg cells, are called (a)   .

A (a)   is DNA tightly wrapped around proteins.

The 2 DNA copies in a chromosome are called ________.

• sister chromatids

• genes

• mutations

• pathogens

How many chromosomes does a human body cell have, total?

• 48

• 46

• 23

• 47

Tags

NGSS.MS-LS3-1

Chromosomes that are organized in pairs, are the same size, and have the same genes are called _______ chromosomes.

• homeostasis

• homologous

• matching

• sister

The 23rd pair of chromosomes that contain the genes to determine the sex of an individual are called Sex Chromosomes. Click on the correct area of the diagram that shows the sex chromosomes.

The 2 female sex chromosomes are ___.

• XY

• XX

The 2 male sex chromsomes are _____.

• XY

• XX

Tags

NGSS.HS-LS3-1

A photograph of the chromosomes in a dividing cell that are arranged by size is called a _________.

• mutation

• gene

• picture

• karyotype

Down Syndrome is also known as _________.

• Trisomy 18

• Trisomy 21

• Monosomy X

• Trisomy 13