unit 5 (genetics) Flashcards
What is the first step in translation?
the first mRNA codon attaches to the ribosomes
What is the second step of translation?
tRNA has an amino acid and an anticodon
What is the third step of translation?
the codon and anticodon attach
What is the fourth step of translation?
tRNA detached but leaves an amino acid
What is the fifth step of translation?
mRNA moves along the ribosome and the process restarts
What is the sixth step of translation?
“stop” codon ends translation
What happens in a gene mutation?
change in one gene in the DNA
What happens in a chromosomal mutation?
chromosome structure/amount changes
What is nondisjunction? draw a picture
homologous chromosomes do not separate during meiosis causing trisomy and monosomy
What is translocation? draw a picture
part of a chromosome breaks and attaches to another chromosome which replaces what should go there
What is insertion? draw a picture
adds to another chromosome after breaking off from another
What is inversion? draw a picture
reattaches backwards
What is the first step of DNA replication?
unzipping (enzymes break hydrogen bonds between base pairs)
What is the second step of DNA replication?
free-floating nucleotides attach base pairs to single-stranded DNA
What is the third step of DNA replication?
two identical copies of the original DNA are created half new half old