Heredity

An allele whose trait always shows up in an organism when the allele is present is a

• recessive allele

• dominant allele

• phenotype

• genotype

Punnett squares are useful because they show the

• actual results of a genetic cross.

• effects of mutations.

• possible results of a genetic cross.

An organism's genotype is its

• physical appearance.

• genetic makeup.

For codominant traits, heterozygroups organism have a phenotype that shows

• only the dominant alleles.

• only the recessive alleles.

• both alleles.

If the body cell of an organism has 16 chromosomes, how many chromosomes do the the sex cells have?

• 32

• 16

• 8

• 23

The different forms of a gene are called

• mutations.

• heterozygous.

• alleles.

• homozygous.

An organism that has two different alleles for a trait is

• heterozygous.

• homozygous.

• mutation.

• meiosis.

The main function of genes is to control

• where the cell divides.

• when sex cells are made.

• the production of proteins.

• the production of carbohydrates.

The cytoplasm is the part of the cell in which

• DNA is located.

• proteins are made.

• RNA is made.

• carbohydrates are made.

The process by which the number of chromosomes is reduced by half in sex cells

• egg.

• meitosis.

• purebred.

• phenotype.