Topic 6 - Heredity (Inheritance) Flashcards Preview

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Flashcards in Topic 6 - Heredity (Inheritance) Deck (19):
1

Inheritance

  • transfer of genetically determined characteristics from one generation to the next

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genetics

study of inheritance

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23 homologous pairs

how many is ___________

how many is ______

  • 22 homologous pairs autosomal - somatic characteristics
  • 1 pair sex chromosomes 

 

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XY

male or female

Male

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XX

male or female?

 

Female

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alleles

genes occupying the same locus on homologous chromoosmes

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alleles may be:

homozygous or heterozygous

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homozygous

  • same allele of a particular gene on homologous chromosomes
  • e.g. both alleles express the same version of a trait
  • e.g. blonde hair (bb), black hair (Bb)

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heterozygous

  • different alleles of the same gene
  • e.g. alleles code for different expressions of the same trait
  • e.g. Bb

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catalogue of a person's genes (genetic makeup)

​e.g. Bb

Genotype

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expression of genotype (genes) to give observable characteristics

e.g. black hair

Phenotype

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  • expressed in phenotype regardless of other allele
  • BB or Bb: ________ expressed 
  • e.g. black hair

dominant allele

B

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  • expressed in phenotyp only if present on both alleles
  • bb
  • blonde hair

recessive allele

b

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  • determines probability of inheritance 
  • predicts offspring genotype and phenotype
  • hair colour trait BB x bb

punnet square

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  • hemophilia
  • colour-blindness
  • duchenne's muscular dystrophy

all due to recessive alleles on the X chromosome

sex-linked inheritance

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sex-linked inheritance

XY = 

not truly homologous

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if gene is X-linked its expression is not masked because there is no corresponding allele on Y chromosome

XX = Homologous

:)

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sex-linked

is colour blindness a dominant or recessive trait?

recessive

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