Mutations occur when in replication there is a variation in a nucleotide and therefore there is variation in a gene. Hence the importance of remembering the basics about nucleic acids • Complete the cards using the data in the box as clues. MRNA = linear, adenine, uracil, ribose, thymine, 2, 1, phosphoric acid (H₂PO₂), tRM = clover, deoxyribose, guanine, DNA replication and self-duplication, rRNA = globular, M-helix model, protein synthesis (translation), transcription, genetic material. Deoxyribonucleic acid DNA = Constituted by: Nitrogen bases: Pentose: Phosphate group: Source: Function: Number of chains: Shape:

Awire-hair terrier and a smooth-hair terrier are mated. the offspring produced are 6 wire-hair puppies and 2 smooth-hair puppies. a. what pattern of inheritance best describes this situation? b. what is the genotype(s) of the wire-haired puppies? of the smooth-haired puppies? c. what would be the expected genotype and phenotype ratios of a mating between 2 wire-haired terriers that are heterozygous?

Describe the layers of the suns atmosphere?

Describe the change in phase and temperature as water moves from the oceans to the atmosphere and then returns to earth again as rain. a) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature decreases b) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature increases c) evaporation : temperature decreases; condensation : temperature decreases; precipitation (rain) : temperature decreases d) evaporation : temperature increases; condensation : temperature increases; precipitation (rain) : temperature decreases