PSYCH 1XX3 Study Guide - Final Guide: Abo Blood Group System, Unit, Egg Cell
13 Apr 2017
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Zygote: sperm + egg together: contains 46 chromosomes 23 from each parent, chromosome: a threadlike structure made from dna segments of dna have genes which are the chemical code for development. Each parent can produce 8 million different genetic combinations 64 trillion distinct offspring. Exception identical twins: monozygotic genetically identical (come from the same sperm and ovum, dizygotic shares 50% of genes. Males determine the sex of the child. 22 autosomes every cell other than what determines sex. Phenotype: the expression of an individual"s genotype in terms of observable characteristics: genotypes can express into different forms of phenotypes. 3 out of 4 children would have curly hair. Cs ss: when the expression of a trait is determine by an interaction of multiple genes, no single gene can account for complex behaviours. Codominance: when the expression of a trait is determined equally by 2 dominant alleles.
