PSYC1003 Lecture Notes - Lecture 6: Chromosome Abnormality, Webbed Neck, Noncoding Dna
12 Jul 2018
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Junk dna, evolutionary significance and evolves very quickly. Only develops after 40, so reproduction already occurred: causes by recessive gene: both copies required, phenylketonuria (pku): Low iq (average = 55: memory and speech problems (oral cavity small compared to tongue) Limited vocab (use gestures more than the average person, use of gestures dominates over speech: motor problems (displaced hip, congenital eye, ear, heart and intestinal defects, more common in older mothers. Shor life span (about 55: abnormalities in sex chromosome, turners syndrome (x0) Female, short, webbed neck, heavy build, infertile, poor memory and spatial ability: 1 in 5000, poly-x-syndrome (xxx) Same dna (although the rise of epigenetics does admit differences)/same environment: fraternal. Some environment/different dna: logic of twin studies. Identical twins - fraternal twins = (genetic + environment) - environment. Smaller brains lacking in cortical convolutions - less brain tissue. Fas: excessive irritability, hyperactivity, seizures and tremors, retarded physical growth.
