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Homo sapiens × Pan troglodytes. The humanzee (sometimes chuman, manpanzee or chumanzee) is a hypothetical hybrid of chimpanzee and human, thus a form of human–animal hybrid. Serious attempts to create such a hybrid were made by Soviet biologist Ilya Ivanovich Ivanov in the 1920s, [1] and possibly by researchers in China in the 1960s, though ...
A human fetus, attached to placenta, at three months gestational age. In humans, the fetal stage starts nine weeks after fertilization. [7] At this time the fetus is typically about 30 millimetres (1 + 1 ⁄ 4 in) in length from crown to rump, and weighs about 8 grams. [7] The head makes up nearly half of the size of the fetus. [8]
In developmental biology, animal embryonic development, also known as animal embryogenesis, is the developmental stage of an animal embryo. Embryonic development starts with the fertilization of an egg cell (ovum) by a sperm cell, (spermatozoon). [1] Once fertilized, the ovum becomes a single diploid cell known as a zygote.
The anatomy of the area surrounding an embryo or fetus is different in litter-bearing animals compared to humans: each unborn animal is surrounded by placental tissue and is lodged along one of two long uterine horns rather than in the center of the pear-shaped uterus found in a human female.
Human embryonic development covers the first eight weeks of development, which have 23 stages, called Carnegie stages. At the beginning of the ninth week, the embryo is termed a fetus (spelled "foetus" in British English). In comparison to the embryo, the fetus has more recognizable external features and a more complete set of developing organs.
Chimera (genetics) Two-colored rose chimera. A genetic chimerism or chimera (/ kaɪˈmɪərə / ky-MEER-ə or / kɪˈmɪərə / kim-EER-ə) is a single organism composed of cells with more than one distinct genotype. Animal chimeras can be produced by the merger of two (or more) embryos. In plants and some animal chimeras, mosaicism involves ...
In 2011, an albino cyclops shark fetus was discovered in the body of a caught shark in Mexico, with no discernible nose and one giant eye. The unborn fetus was turned over for medical studies. [20] On October 10, 2012, a small kitten was born. Its eye was in the center of the forehead and there was no developed nose to be found.
Echidnas are medium-sized, solitary mammals covered with coarse hair and spines. [6] The spines are modified hairs and are made of keratin, the same fibrous protein that makes up fur, claws, nails, and horn sheaths in animals. [2] Spines of the echidna. Superficially, they resemble the anteaters of South America and other spiny mammals such as ...