PSYCH 1XX3 Chapter Notes - Chapter 2: Phenotypic Trait, Y Chromosome, Egg Cell
16 Mar 2018
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Document Summary
We must understand how genetic traits are inherited and shape who you become. Is a thread like structure made from dna: segments of dna comprise genes which provide the chemical code for development, chromosomes contain 30-40 thousand genes. If they pass on a y, the child is male. If they pass on an x, the child is female. Puts forth an x chromosome only for pregnancy. Can express into different forms of phenotypes. There are four main patterns of genetic expression (see 1, 2, 3, 4) The e(cid:454)pressio(cid:374) of a(cid:374) i(cid:374)di(cid:448)idual"s ge(cid:374)ot(cid:455)pe i(cid:374) ter(cid:373)s of o(cid:271)ser(cid:448)a(cid:271)le (cid:272)hara(cid:272)teristi(cid:272)s. A phenotypic trait is often governed by multiple pairs of genes. Homozygous: when two alleles have the same effect on the phenotype. Heterozygous: when two alleles have a different effect on the phenotype, dominant allele is expressed in the phenotype, recessive allele not expressed but still heritable. When the expression of a trait is determined by the interaction of multiple genes.
