Bio Genetics Review

As a human, how many pairs of chromosomes exist in each of your cells?

• 10
• 12
• 23
• 46

Why do you have homologous pairs of chromosomes in all your somatic cells?

• Scientists have no idea
• Because you get one from your mom and one from your dad
• Because pairs can divide easier
• Because DNA is awesome

Genotype refers to the ...

• physical expression of the genes.

• the possible combination of alleles in a gene.

• whether an allele is dominant or recessive.

• how an organism will appear.

An offspring will receive how many alleles from each parent to determine a specific trait?

• one
• two
• three
• five

What is a phenotype?

• The genetic make up (code)
• The physical trait (appearance)

Having two of the same genes for the trait (sometimes called purebred).

• homozygous
• hetrozygous
• protein
• chromosome

An allele whose trait only shows up when no dominant allele is present.

• hidden allele
• dominant allele
• recessive allele
• present allele

Different versions of genes are called...

• chromosomes.

• segments.

• alleles.

• operons.

A codon is a sequence of three nucleotides that code for an amino acid. If the DNA sequence shown here goes through transcription and translation, how many amino acids will result from this sequence?

ACTAGTGAT

• 5

• 4

• 2

• 3

What process is used for the creation of gametes (sperm or egg)?

• Mitosis

• Meiosis