Chromosomes

Histones are 

• proteins wound up in DNA
• critical to maintaining the shape of chromosomes
• aid in the tight packing of DNA
• all of these 

Tags

NGSS.HS-LS1-1

When DNA is in its less coiled, "relaxed," state, between cell divisions, it is called

• autosomes
• chromatid
• chromatin
• centromere

Autosomes are

• chromosomes found in autotrophs, only
• chromosomes that automatically correct all errors in the DNA
• chromosomes that determine traits other than sex
• chromosomes that determine the sex of the individual

Tags

NGSS.HS-LS3-1

The structure that holds two chromosomes together until they separate for cell division is the

• chromatid
• chromatin
• centromere
• cytoplasm

Tags

NGSS.HS-LS1-4

The structures labeled B are

• centrioles
• chromatids
• centromeres
• chromopheres

Tags

NGSS.HS-LS1-4

The structure labeled A is a(n)

• chromatid
• centriole
• centromere
• chromophere

Tags

NGSS.HS-LS1-4

Chromosomes that have the same sequence of genes and the same structure are ___________.

• homologous chromosomes

• alleles

• phenotypes

• genotypes

Which of the following statements about homologous chromosomes is correct?

• Each gene is at the same locus on both chromosomes.
• They are two identical copies of a parent chromosome which are attached to one another at the centromere.
• They come from the same parent.
• They are chromosomes that have identical genes and alleles.

Tags

NGSS.HS-LS3-2

How many autosomes are there in a human sperm?

• 1
• 22
• 23
• 46

Tags

NGSS.HS-LS3-2

Based on the Karyotype shown, at which chromosome pair can we identify a genetic disorder? 

• Chromosome pair 5
• sex chromosomes
• Chromosome pair 21
• There are no chromosomal disorders