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Ch. 17: Genetics, Cross-Link Connection: Plastid mutations in the cactus…
Ch. 17: Genetics
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Dihybrid Crosses
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independent assortment
two genes
seperate chromosomes
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duplicate
S phase
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metaphase I
pairing
anaphase I
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linkage
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linkage group
genes
known
to be
linked
same amount
chromsomes
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not linked
not mapped
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Concepts
Replication of DNA
Replication
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chromatin
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opens
entry
replicating factors
DNA
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ribonucleotides
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Cross-Link Connection: Plastid mutations in the cactus genus Gymnocalycium cause red and orange seedlings to appear in nurseries. These mutations cause the plant to lack chlorophyll but through the grafting of these plants to a green cactus they are able to survive using their sugar.
Cross-Link Connections: As corn seeds mature they fill with the protein zein. Each nucleus has two families with about 25 copies of the gene causing the mRNA to be produced rapidly. Each zein parlog evolves independently allowing them to produce a zein protein 90% identical to those produced by any other member of the gene family.
Cross-Link Connection: If an allele is formed by a mutation in a haploid plant like say moss it will find itself as the sole allele for the gene.This can be beneficial only if it lands in a suitable habitat for that gene. Most likely the moss will land in a habitat like their parent and the allele will be eliminated. The gene pool of the moss will then return to normal and have no new genetic resources to help with adaptation or changing conditions.
