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Back to Study: From landrace to modern hybrid broccoli: the genom...
descriptive
Analysis v1
37
Pro
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Against

Scientists found 53 spots in the broccoli genome where genetic variation has been wiped out — likely because breeders picked plants with certain traits so often that other versions disappeared.

Scientific Claim

Genomic scans reveal 53 selective sweep regions and 13 regions of drastically reduced nucleotide diversity in modern hybrid broccoli, suggesting strong historical selection during domestication.

Original Statement

“Within these modern hybrids, we identified 13 reduction-in-diversity genomic regions, 53 selective sweeps, and 30 (>1 Mbp) runs of homozygosity.”

From study:From landrace to modern hybrid broccoli: the genomic and morphological domestication syndrome within a diverse B. oleracea collection.

Evidence Quality Assessment

Claim Status

appropriately stated

Study Design Support

Design supports claim

Appropriate Language Strength

association

Can only show association/correlation

Assessment Explanation

The study identifies statistical patterns in genomic data without proving causation. 'Reveal' and 'identified' are appropriate for observational detection.

Evidence from Studies

Supporting (1)

37
37

From landrace to modern hybrid broccoli: the genomic and morphological domestication syndrome within a diverse B. oleracea collection.

Cross-Sectional Study

Scientists found that modern broccoli has lost a lot of its genetic variety and has specific spots in its DNA that were strongly chosen by breeders over time—this proves it was heavily shaped by human selection during domestication.

Contradicting (0)

0
No contradicting evidence found

Source Study

From landrace to modern hybrid broccoli: the genomic and morphological domestication syndrome within a diverse B. oleracea collection.

Score: 37
DOI: 10.1038/s41438-020-00375-0

Similar Assertions

The DNA of modern broccoli has more A and T building blocks than older types — a pattern also seen in corn and soybeans, likely from long-term breeding.

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37
83%

The broccoli we buy in stores today has much less genetic variety than the old-fashioned types grown in southern Italy, meaning farmers have lost a lot of natural diversity by breeding for uniformity.

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80%

Sprouting broccoli has way more unique genetic variants than store-bought broccoli, making it a treasure trove for breeders trying to add new traits.

37
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75%

A specific spot on broccoli’s 9th chromosome — which controls when it flowers and how it handles heat — has been heavily selected by breeders, making it a key target for improvement.

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37
73%