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The neucleus of every cell contains threads called

• Genes

• Cell wall

• Chromosomes

• Xylem

Each chromosome is made up of hundreds of

• Genes

• DNA

• X chromosome

• Y chromosome

Each chromosome has————— Copies of itself

What is a gene?

• Long strands of DNA that contain lots of genes.

• Different versions of a gene.

• The basic unit of heredity; controls a specific trait.

• A characteristic passed from parent to offspring

• The differences that occur from a mixture of genes

If P represents purple color, and p represents white color, what combination(s) of factors represents white color?

• PP and Pp

• pp only

• Pp only

• PP only

An allele is

• a specific version of a gene

• a mutated gene

• a frequently occurring gene

• a chromosome abnormality

genotype

• the allele combination of an organism

• different forms of genes

• alleles for traits are the same

• factors that determine traits

phenotype

• factors that determine traits

• every organism has two alleles which separate when gametes are produced

• genes for different traits are inherited independently of each other

• the way an organism looks and behaves

homozygous

• the allele combination of an organism

• different forms of genes

• alleles for traits are the same

• factors that determine traits

What are the 4 nitrogen bases?

• adenine, thymine, cytoplasm, and guanine
• adenine, thymine cytosine, and guanine
• adenine, thymine, cytosine, and gylcerol
• adenine, thymine, cytosine, and glucose