periods

Uterus

...he uterus between two males have shorter fertile periods than do females that develop between two females. Male mice prefer to mate with the females that develop in an all-female environment . Full article >>> Endometrium the richly-vascularized lining of the uterus which brings food to ...

Unicellular

...form over time and that slight changes over long periods can have large- scale consequences; proposed by James Hutton in 1795 and re? Full article >>> Unicellular or multicellular photosynthetic eukaryotes that generally lack roots , stems, leaves, conducting vessels , and complex sex...

Transition

...re only in existence for extremely brief (10-15 s) periods of time. Full article >>> The transition from the Medieval Warm Period to the Little Ice Age Beginning of the Ottoman Empire, early expansion into the Balkans The Avignon papacy trans fers the seat of the Popes from Italy to Franc...

Survival

...logical state that allows survival during long periods of cold temperatures and reduced food supplies, in which metabolism decreases, the heart and respiratory system slow down, and body temperature is maintained at a lower level than normal. Full article >>> K-strategist Species of ...

Spore

... adapted for dispersion and surviving for extended periods of time in unfavorable conditions. Full article >>> SYN: asexual spore (1) In plant s and fungi , sexual spore s are the haploid cell s produced by meiosis . (2) In fungi , asexual spore s are somatic cells that are ca...

Serum

...eptor . Growth phase (curve). The character istic periods in the growth of a bacteria l culture , as indicated by the shape of a graph of viable cell number versus time. Full article >>> hapto- bind to haptoglobin serum protein which binds free hemoglobin for trans port to the liv...

Receptor

...eptor . Growth phase (curve). The character istic periods in the growth of a bacteria l culture , as indicated by the shape of a graph of viable cell number versus time. Full article >>> chlorophyll s A family of green pigment s functioning as receptor s of light energy in photosynt...

Punctuated equilibrium

...ciation can occur relatively quickly, with long periods of little change—equilibria—in between...urs in relatively rapid bursts, followed by longer periods of stasis. Full article >>> Punctuated Equilibrium According to another model based...

Placental mammals

... carry their young in the mother's body for long periods during which the fetus is nourished by the placenta . Human s are placental mammals . Full article >>> Placental mammals ; those whose young complete their embryo nic development within the uterus , joined to the mother by the ...

Placenta

... carry their young in the mother's body for long periods during which the fetus is nourished by the placenta . Human s are placenta l mammals . Full article >>> placenta - embryo nic/maternal organ that serves nutrition al and respiratory functions of the mammalian fetus . Full...

Phylogenetic tree

...ceeds by spurts of change interspersed with long periods of stasis (genetic stability) where selection favors no change. Full article >>>...

Paleontology

... study of the fossil record of past geo- logical periods and of the phylogenetic relationships between ancient and contemporary plant and animal species . Palindrome. See Palindromic sequence . Palindromic sequence . Full article >>>...

Ovum

... study of the fossil record of past geo- logical periods and of the phylogenetic relationships between ancient and contemporary plant and animal species . Palindrome. Full article >>> Mature male or female reproductive cell ( sperm or ovum ) with a haploid set of chromosomes (23...

Mesozoic Era

...;>> : The youngest of the three geologic periods of the Mesozoic era (145 to 65 Mya ). Crossing -over ... Full article >>>...

Memory cell

...the circulatory system for later use, for long periods of time, possibly a whole lifetime. Full article >>> Their antigen receptor s are surface immunoglobulins ( antibodies ). They recognize peptides directly and secrete antibodies by differentiating into plasma cells . They also ...

Memory

...the circulatory system for later use, for long periods of time, possibly a whole lifetime. Full article >>> Memory and the Hippocampus Psychologists have long argued that there are many different types of memory . Full article >>> memory cell A clone of long -liv...

Macroevolution

...f species , which is microevolution over long periods of time that leads to speciation . Full article >>> What is macroevolution ? n science, macro at the beginning of a word just means "big", and micro at the beginning of a word just means "small" (both from the Greek words). Full art...

Germ line

...er hand, have the ability to divide for indefinite periods and to give rise to specialized cells . Full article >>> Germ line gene therapy An experimental process of insert ing genes into germ cells or fertilized eggs to cause a genetic change that can be passed on to offspring . May ...

Fossil

... study of the fossil record of past geo- logical periods and of the phylogenetic relationships between ancient and contemporary plant and animal species . Palindrome. See Palindromic sequence . Palindromic sequence . Full article >>>...

Equilibrium

...ciation can occur relatively quickly, with long periods of little change—equilibria—in between...urs in relatively rapid bursts, followed by longer periods of stasis. Full article >>> Hardy-Weinberg equilibrium (HWE) : In an infinitely lar...

Dispersal

...ival of the species during unfavorable climatic periods (e.g., winter). "Annual" plant s (e.g., beans, cereal grains, many weeds) can survive freezing only as seeds. Full article >>> dispersal A more or less permanent movement of an individual from an area, such as movement of a juvenile...

Circulatory system

...the circulatory system for later use, for long periods of time, possibly a whole lifetime. Full article >>> CardiovascularSystem another name for the circulatory system consisting of heart arteries and veins (cardio = heart ; vascul = a little vessel) Carnivore animal which...

Chromatin

...formed of DNA and protein and observed between periods of cell division in eukaryotic cells . Covered in Lab 3 Cell Biology ... Full article >>> Chromatin : The complex of DNA and associated histone and non- histone proteins that represents the normal state of genes in the n...

Character

...ull article >>> The character istic periods in the growth of a bacteria l culture , as indicated by the shape of a graph of viable cell number versus time. (See Death phase, Lag phase , Logarithmic phase, Stationary phase.) H Haploid cell . Full article >>> Achondroplasia ...

Cell division

...eptor . Growth phase (curve). The character istic periods in the growth of a bacteria l culture , as indicated by the shape of a graph of viable cell number versus time. Full article >>> So that it replicates and is segregated during cell division in the same way as a normal chromosome...

Cell cycle

... activated by defined cyclins, appearing for given periods in the cycle. Full article >>> Cell Cycle Normal cells grow and divide in an order ly fashion, in accordance with the cell cycle . Full article >>> Cell cycle : Interphase followed by mitosis Mitosis is divi...