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Life sciences Gr12 IEB: Genetics $5.71   Add to cart
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Life sciences Gr12 IEB: Genetics

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  • Course
  • Life Sciences
  • Institution
  • 12th Grade

A power point created by a 2021 IEB matric student. Notes consist of: Genes and alleles; Zygosity; Type of genes; Gregor Mendel & his research; Mendel's Laws; Genetic diagrams; Predicting genotypes; Test crosses & monohybrid crosses; Sex chromosomes & sex-linked diseases; Polygenic inheritance; G...

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Document information

  • January 11, 2022
  • 31
  • 2021/2022
  • Presentation
  • Unknown

Subjects

  • ieb
  • matric
  • gr 12
  • life sciences
  • biology
  • genetics
  • notes

Written for

  • 12th Grade
  • Life Sciences
  • 200
All documents for this subject (1094)

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By: kegomoditswerankokwadi • 1 year ago

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Genetics
The study of heredity (the passing on of genes) in an organism

,Genes and alleles
• Gene = a section of DNA that codes for a protein
• Alleles = different versions of the same gene
• Each cell contains 2 of each kind of chromosome since 23 are maternal and 23 are
paternal therefore each cell has 2 of each kind of gene hence there are different versio
for every trait = allele
• Alleles = same locus. Dominant traits = uppercase letter. Recessive trait = lowercase le
• A recessive trait is only expressed in the offspring when both recessive alleles are pres
• Gene pool = the full set of all the genes or genetic material in a sexually reproducing
population
• Large gene pool = large genetic variety, higher chance of survival
• Small gene pool = minimal genetic variety, less chance of survival

,Zygosity
• Homozygous = both alleles are the same for a particular trait
• Heterozygous = a pair of alleles are different for a particular trait

, …types
• Genotype = all genes an organism has on its chromosomes…the
zygosity BB or Bb or bb
• Phenotype = the physical appearance of an organism, which is
determined by the genotype and external / environmental factors

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