Chromosomes, Genes and Allele

Thread-like structures located inside the nucleus of animal and plant cells are called

• Chromosomes
• Plasmid

• Gene

• Alelle

Humans have ____________ pairs of chromosomes

• 19

• 23

• 46

• 25

For an organism to grow and function properly cells must constantly __________ to produce ________________

• divide, new cells

• repeat , die

• divide, copies

• copy, divide

DNA is passed from

• offspring to parents

• Parents to offspring

• Offspring to offspring

• Parent to parent

Pairs of similar chromosomes are called...

• homologous chromosomes

• sister chromatids

When a cell divides, DNA strands coil around proteins to form ...

• chromatid

• chromosomes

• chromocoiled

Answer explanation

Chromosomes are the coiled up form of DNA. Chromatin is loose DNA strands.

Homologous chromosome pairs are a combination of how many chromosomes from each parent?

• 1 from each parent

• 2 from each parent

• Half from each parent

What is an organized picture of all of an organism’s homologous chromosome pairs lined up with each other?

• Pedigree

• Karyotype

In a duplicated chromosome, sister chromatids are attached by what structure?

• centromere

• centriole

• chromatin

• chromosome

Cells that contain 2 sets of chromosomes are called ...

• haploid

• diploid