Ch3 cd - Ch.3:GeneticsandPrenatalDevelopment GENETICS 16:04...

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Ch. 3: Genetics and Prenatal Development 16:04 GENETICS -Our genetic code is stored in our genes. All genes are composed of DNA (deoxyribonucleic acid) that determines the nature of every cell in our bodies and how they will function. -46 chromosomes are organized into 23 pairs of DNA portions. -A zygote is a new cell formed by fertilization -Gametes are sex cells from the mother and father that form a new cell at contraception Basics of Genetics -Dominant trait: one trait expressed when two competing traits are expressed -Recessive trait: a trait present in an organism but not expressed -Genotype: the underlying combination of genetic information (not outwardly visible) -Phenotype: an observable trait -Homozygous: similar genes for a given trait that are inherited from parent -Heterozygous: different forms of a gene for a given trait inherited from parent -Gregor Mendel: pioneered experiments on pea plants that provided the foundation for the study of genetics -Polygenic inheritance: a combination of multiple gene pairs is responsible for production of a particular trait -X-linked genes: recessive and located only on the X chromosomes (ex. Hemophilia is produced by X-linked genes)
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Ch3 cd - Ch.3:GeneticsandPrenatalDevelopment GENETICS 16:04...

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