Chromosomes Quiz

How many chromosomes do humans have?

• 21,000

• 3 billion

• 23

• 2

Label each area of the complete set of genetic information diagram

a

b

c

Autosomes

Genes

Proteins

Sex chromosomes

DNA

Organize each species based on their sex chromosomes

Groups:

(a) XX female, XY male

,

(b) ZW female, ZZ male

,

(c) XXXXXXXXXX female, XXXXXYYYYY male

,

(d) none

• Honey bee

• Platypus

• Earthworm

• Pigeon

• Human

• Fruit Fly

• Chimpanzee

• Pea plant

By wrapping DNA more or less tightly, ____ control which genes are active (being read to build proteins) and which genes are not.

Chromosomes are numbered according to their ​ (a)   , and ​ (b)   are arranged along them in a specific order.

• size
• genes
• histones
• chromosomes
• autosomes

Why do humans have two sets of chromosomes?

• We inherit one set from each parent

• We need a backup in case the genes on one chromosome aren't correct

• We donate one when we have children

• To have extra

Genes make up ___% of our genome.

Choose all that could be a purpose of non-coding DNA

• hold information about which cells should make proteins, when they should make it, and how much they should make

• left by viruses that infected our ancestors many generations ago

• hold space for us to create more coding DNA as we grow

• has no function

What happens to DNA when a cell gets ready to divide?

• histones detach from DNA, making room for division

• additional histones attach to DNA, coiling it even tighter

• Histones regulate the access to DNA

• Histones stop reading DNA

True or False: Species vary in the amount of chromosomes they have.

• True

• False