7-2 Review....7th science

If the body cell number of Carrots is 18, the sex cell number is

• 18

• 9

• 27

• 36

chromosomes that have the same sequence of genes and the same structure

• homologous chromosomes
• alleles
• phenotypes
• genotypes

An alternative form of a gene

• genome
• allele
• dominant
• recessive

The number of human sex cell chromosomes is

• 11

• 12

• 23

• 46

The number of human chromosomes in body cells

• 23

• 46

• 92

Each identical side of a chromosome is the 

• centromere
• chromatin
• centriole
• chromatid

A _______ is a segment of DNA that codes for a specific protein or RNA molecule.

• gene

• gamete

• chromosome

• chromatid

A _________ is DNA tightly coiled around proteins.

• gene

• chromosome

• trait

• mutation

The 2 exact copies of DNA in a chromosome are called ________.

• chromatids

• genes

• mutations

• pathogens

A _______ is an egg that has been fertilized by a sperm cell.

• gene

• chromosome

• zygote

• embryo