Science Flashcards
(37 cards)
Chromosomes
Long, tread like structures in nucleus
How many chromosomes are in every cell
46
Genes
Basic units of heredity
What are genes responsible for
Characteristics
What types of genes are there
Structural
Regulatory
What are structural genes responsible for
Physical traits
What do regulatory genes do
Control activity of genes
DNA
Deoxyribonucleic acid
What are four bases of DNA
Adenine
Thymine
Guanine
Cytosine
Base pair
Two nucleotides bonded together with hydrogen bonds
Codon
Three nucleotides that code for a specific amino acid
RNA
Translate genetic code of DNA into protien
Translation
Making protein from RNA
Transcription
Making RNA from DNA
RNA polymerase
Enzyme catalyzes formation of RNA from nucleotides
What are types of RNA
Messenger- Carrie’s genetic code in nucleus to ribosomes
Transfer- assemble amino acid into protein in translation of genetic sequence
Ribosomal- make up ribosomes
mRNA
Attaches to small subunit of ribosome
tRNA
Brings amino acids to ribosome
Codon
Group of 3 nucleotides
Mendels law of inheritance
Two alleles for each trait
Alleles
Alternate forms of gene
Genotype
Combination of two alleles
Heterozygous
Chromosomes contain 2 different alleles for trait
Homozygous
Chromosomes contain 2 identical alleles