PRIMA 2014 REPRODUCTION Výukový materiál GE Tvůrce: Mgr. Šárka Vopěnková Tvůrce anglické verze: ThMgr. Ing. Jiří Foller Projekt: S anglickým jazykem do dalších předmětů Registrační číslo: CZ.1.07/1.1.36/ Tento projekt je spolufinancován ESF a SR ČR
asexual reproduction by: yeast > sprouting protozoa > division plants > vegetative cnidarians > jellyfish tunicates > sprouting ASEXUAL REPRODUCTION
special asexual reproduction in arthropods and vertebrates: fertilized egg cell divides into two or more parts new individual develops of each part separately monozygotic twins: rarer than fraternal ASEXUAL REPRODUCTION
fraternal twins: they are formed by the fertilization of two eggs each by a different sperm they might not be of the same sex two siblings of the same age different in many features TWINS
Siamese twins: they were a popular attraction they arise if cells are completely detached from each other fusion of the body is in many cases accompanied by medical complications, e.g. interconnection of blood circulation TWINS
ORIGIN OF TWINS
Siamese twins – fused foeti SIAMESE TWINS
heredity and IQ: a number of studies have been based on monitoring of twins it was showed that the heritability of intelligence is not small the heritability of intelligence is estimated between 60 – 80 % only about 20 – 40% is a result of upbringing and education IQ
Describe the picture Which twins are identical? WORKSHEET
KOČÁREK, Eduard. Genetika: obecná genetika a cytogenetika, molekulární biologie, biotechnologie, genomika. 2. vyd. Praha: Scientia, 2008, 211 s. ISBN DOBRORUKA, Luděk J. Přírodopis. 2. vyd. Praha: Scientia, 1999, 127 s. ISBN SOURCES