Extra nuclear Inheritance And Maternal Effect Flashcards

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1
Q

Do cytoplasmic inheritance follow medilian inheritance

A

No

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2
Q

Is cytoplasmic inheritance biparental or uniparent

A

Biparental - rare
Uniparental- mostly

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3
Q

Which parents is usually involved in extranuclear uniparental transmission

A

Maternal

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4
Q

Maternal inheritance vs maternal effect

A

Maternal inheritance - cytoplasm and extranuclear by mother

Maternal effect- nuclear genotype of mother determines phenotype of offspring even when genes transmitted by both sexes

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5
Q

Example of cytoplasmic/extranuclear inheritance

A

Mirabilis jalapa- fouroclock plant

Seed from white branch gave white progeny no matter on pollen

If branch has both white and green, it can be white or green or both white and green

Reciprocal cross different

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6
Q

Phenotype controlled by mitochondrial gene

A
  1. Petite( small colony of yeast) mutants of baker’s yeast ( saccharomyces cerevisiae)

Petite if small- bc low respiration, low groeth rate

Petite × wild
Segregation (mutation in nuclear gene - follow mendel)
Vegetative- neutral or suppressive (mutation in mitochondrial gene)

Segregation × wild- both petite and wild
Neutral× wild- wild all
Supressive × wild- mostly petite

  1. Cytoplasmic male sterility
    Plant can’t form functional pollen
    Had S sterility factor instead of F fertility factor
    Recessive trait
    Dominant allele of nuclear fertility restorer fene- Rf- NO CMS
  2. Endosymbiont
    Paramecium release paramicin which toxic to other bacteria - but requires kappa particals

If mu partical present kills other cells by conjugation

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7
Q

Example of maternal effect

A

Coiling direction of shell 🐚 in lymnaea peregra
Mother controls
Coiling - left handed (sinister)
Right handed (dextral)
Till F2 result same as mendel
F3 difference

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