Is a clone the same sex and age as its mother?

Q: Is a clone the same sex and age as its mother?

A cannabis clone is genetically the same as its mother, including her sex: every clone of a female is female. It is also physiologically mature, not a new seedling, so it can flower as soon as it gets 12/12. Apart from rare somatic mutations and carried-over pathogens such as hop latent viroid, it is the same genotype; there is zero genetic drift.

Short answer

A cannabis clone is the same genotype as its mother, so it is the same sex: clones of a female are female. It is also mature tissue, the "age" of the mother rather than a seedling, and can flower as soon as it gets 12/12. Established.

Why

Cloning is vegetative propagation: a rooted cutting carries the donor's full genome, including the sex chromosomes ^[1].

Mutations are rare and not a loss. Sequencing finds a few somatic mutations accumulating in different parts of a plant and its clones ^[2]. House position: zero genetic drift in a well-kept cut apart from pathogens.

Cuttings keep their physiological age. Propagation science calls this cyclophysis and topophysis: a cutting carries the maturity and character of the shoot it came from ^[3]. That's why a clone can flower small and why cuts from different branches can behave differently for a while.

Pathogens travel too. Hop latent viroid passes through infected cuttings and reduces flower mass and quality, often without obvious symptoms ^[4].

The numbers

Trait	Same as mother?
Genotype	Yes, apart from rare somatic mutations
Sex	Yes
Ability to flower	Immediately on long nights (photoperiod)
Chemotype potential	Yes, environment permitting
Pathogens (HLVd, mites)	Yes, if present
Early growth habit	Can differ by cutting position

What to do

Take cuts from consistent locations: vigorous upper-to-mid shoots.
Label every clone with its source and date.
Test valuable mothers for HLVd and quarantine new cuts.
Expect a clone to flower small; give it enough veg for the canopy you want.
Compare clones side by side before blaming "genetics".

Common mistakes

Expecting a clone to need weeks of "growing up" before it can flower.
Assuming a clone of a herm-prone plant will be stable.
Blaming age for a weak cut without testing for HLVd.
Taking cuts from random spots, then calling them different phenotypes.

Full article: Clone-only cuts and how to preserve them
Sex: male, female, hermaphrodite · Hop latent viroid
Can you clone an autoflower?
Terms: topophysis · cloning

The genotype is the set of alleles a plant actually carries, either at one locus or across its whole genome, as opposed to the traits you can see.A seedling is a young cannabis plant from emergence of the cotyledons until it has several sets of true leaves, typically the first 2-3 weeks.12/12 is the classic flowering schedule for photoperiod cannabis: 12 hours of light and 12 hours of uninterrupted darkness, which triggers and sustains flowering.Cloning is propagating a plant by rooting cuttings from it, producing new plants that are genetically identical to the donor.Cannabis uses an XY sex determination system: females carry two X chromosomes (XX) and males an X and a Y (XY), so regular seed is roughly half male.Genetic drift is random change in allele frequencies between generations of a seed population, strongest in small populations; clones do not drift this way.Topophysis is the tendency of cuttings to keep traits linked to the position on the mother plant they were taken from, so cuts from different parts can behave differently.HLVd, a small infectious RNA that spreads through sap and tools, causing stunting, brittle stems, small loose buds and reduced resin in cannabis; called dudding.The daily length of light versus dark; photoperiod cannabis flowers when nights grow long enough, rather than at a fixed age.A chemotype is a plant's chemical phenotype, in cannabis usually its dominant cannabinoid class: THC-dominant (I), mixed (II), CBD-dominant (III), CBG-dominant (IV) or cannabinoid-free (V).Tetranychus urticae, the commonest cannabis mite indoors: a 0.5 mm sap-feeder that stipples leaves pale and spins webbing, breeding fastest in hot, dry rooms.A mother plant is a female kept permanently in vegetative growth to supply cuttings, so a selected genotype can be propagated as clones indefinitely.Herm-prone describes a line whose plants often produce intersex flowers; GenetixBay treats this as a breeding fault and a reason not to breed from it.The phenotype is what a plant visibly and measurably is (shape, colour, smell, chemistry, timing), the result of its genotype acting in a particular environment.

Follow-up questions

Why do clones from the same mother grow differently?

Clones from the same cannabis mother can grow differently because of position effects, called topophysis: a cutting can 'remember' whether it came from a vigorous leader or a shaded lower branch. This is a physiological carry-over and may or may not involve mutation. Pathogens such as HLVd, and differences in how cuts are rooted and grown, also cause differences.

Can a clone flower straight away?

Yes. A rooted cannabis clone from a photoperiod mother is mature tissue, so it can flower as soon as it gets long nights, even at 15 cm (6 in) tall. That is how sea-of-green growers flower small clones after a short veg. A clone from an autoflower is a different case: it keeps the mother's countdown and usually flowers small.

Do clones get weaker with every generation?

No. GenetixBay's position is that a well-kept cannabis cut shows zero genetic drift apart from pathogens such as hop latent viroid. Sequencing does find rare somatic mutations, but no study links them to the decline growers describe, and the founder keeps cuts over 40 years old with no decline. If a cut 'got weak', test it for HLVd first.

Sources

Clarke RC, Merlin MD. 2013. Cannabis: Evolution and Ethnobotany. University of California Press. doi.org/10.1525/9780520954571

Adamek K, et al. 2022. Accumulation of somatic mutations leads to genetic mosaicism in cannabis. The Plant Genome 15(1):e20169. doi.org/10.1002/tpg2.20169

Olesen PO. 1978. On cyclophysis and topophysis. Silvae Genetica 27(5):173-178. thuenen.de/media/institute/fg/PDF/Silvae_Genetica/1978/Vol._

Adkar-Purushothama CR, Sano T, Perreault JP. 2023. Hop latent viroid: a hidden threat to the cannabis industry. Viruses 15(3):681. doi.org/10.3390/v15030681