= BABY BOOM1
{c}
<BABY BOOM1> is a rice <transcription factor> that can initiate <embryonic development>. Its early expression in the <zygote> normally involves the paternal <allele>, connecting a contribution from the male <gamete> to the start of a new developmental programme.
<Imtiyaz Khanday> and colleagues redirected <BABY BOOM1> expression into the unfertilized <ovum>. This was sufficient to initiate an <embryo> without <fertilization>. Combining that trigger with altered <meiosis> enabled clonal <seed> production in an engineered system.<A male-expressed rice embryogenic trigger redirected for asexual propagation through seeds by Imtiyaz Khanday and others>[Abstract: male-gamete expression, egg-cell expression, parthenogenesis and combination with meiosis modification; online 2018, journal issue 2019]{ref}
The components solve different problems: initiating an <embryo> does not by itself prevent the genetic reshuffling and chromosome-number reduction of ordinary <meiosis>. This separation explains why a single developmental trigger and a complete clonal propagation system are different experimental achievements.
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