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a Related Biological Terms:

anisogamous

Sexual reproduction in which the gametes differ from each other morphologically

anisogamy

condition in which the female gamete is larger than the male gamete; contrast with Isogamy

Anlage

Embryonic primordium from which a specific part of the organism develops. The rudimentary basis of an organ in an Embryo.

annealing

Spontaneous alignment of two complementary single Polynucleotide (RNA, or DNA, or RNA and DNA) strands to form a double helix.

annelid

A segmented worm.

Annotation

Adding pertinent information such as gene coded for, amino acid sequence, or other commentary to the database entry of raw sequence of DNA Bases.

annual

a plant that naturally completes its life cycle, from seed to seed, in one year.

annual rings

layers of wood laid down each year by the vascular cambium of woody plants, typically in trees. During the season of active growth in the vascular cambium, xylem Cells are being added to the circumference of the xylem tissue. At the start of the growing season the Cells grow fast and are large, but as the season progresses towards the dormant period fewer smaller Cells are produced and growth eventually stops as the plant becomes dormant. The difference in size of the xylem Cells laid down at the start and later in the growing season forms a LINE within the wood marking the boundary of an annual ring. The size of the xylem Cells is also affected by the growing conditions. Hence changes in the width of annual rings can indicate changes in the climate.

annulate

ringed or banded.

ANOVA

See analysis of variance.

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