NATS 1675 Lecture Notes - Lecture 29: Messenger Rna, Sexual Reproduction, Haemophilia
4 Aug 2015
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Document Summary
Nucleotides form a double helix structure; code for genes. A + t + g + c, sugar + phosphate. Because of the chemical structure a goes with t, c goes with g. Cell division that results in four daughter cells. Reduces the chromosome number from 46 to 23. A trait may have two or more forms of expression. Some traits have two alleles and others may have several different forms. Each form that a trait can be expressed in is termed an allele. Each specific allele is programmed by a file of genetic information termed a gene. One allele of an eye colour gene produces brown eyes and another allele of an eye colour can produce green eyes. We can look at blood types at alleles at the molecular level. Alleles are variations that the trait can come in genes are the genetic files for the alleles genes are dna sequence alleles are what we see expressed.
