Xxy chromosomes - PowerPoint PPT Presentation

Mutations

Mutations. What Are Mutations?. Changes in the nucleotide sequence of DNA May occur in somatic cells (aren’t passed to offspring) May occur in gametes (eggs &amp; sperm) and be passed to offspring. Are Mutations Helpful or Harmful?. Mutations happen regularly

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DNA and Cell Replication

DNA and Cell Replication. DNA. Deoxyribonucleic acid Sugar-phosphate “backbone” with nucleotide “ladder steps” Has 2 complementary strands. Nucleotides. 4 different nucleotides A=adenine T=thymine C=cytosine G=guanine A always pairs with T G always pairs with C Called base pairs.

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283 views • 18 slides

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