{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

geneticcs - Genetics and the Life Span Why is genetics...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Genetics and the Life Span Why is genetics important to life-span development? Genetic Foundations What is the difference between phenotype and genotype ? Whether or not a particular characteristic is expressed is often determined by our genotype (Dominant-Recessive Inheritance) Ex: Curly Hair, Facial Dimples Genetic Material and Processes • Material: – Chromosomes 23 pairs (22 pair autosomes, 1 pair sex) – Gene • Alleles Homozygous vs. Heterozygous – Deoxyribonucleic acid (DNA) • Processes: – Mitosis – Meiosis • Gametes • Zygote
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
2 Dominant-Recessive Inheritance •The dominant allele determines phenotype, whereas the recessive allele does not affect phenotype. However, if have 2 recessive alleles, that genotype will be expressed. VERY FEW diseases that have a dominant inheritance. Why? Ex: Huntington Disease Ex: Phenylketonuria (PKU), Curly Hair, Facial Dimples, Type A vs. Type O Keep in Mind: Parent can be carriers (heterozygous) X-Linked Inheritance Phenotypes related to traits