HD 101 Lecture Notes - Lecture 2: Conjoined Twins, Primitive Streak, Egg Cell
15 Jan 2017
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The beginning of life instructions in their molecules of dna. 23 chromosomes from each parent cell nucleus chromosome dna molecule (tagc) reproductive cells (sperm and ova) each gamete consists of 23 chromosomes. Genes are passed down from generation to generation. Triplet variations variation occur because dna code contains 3 billion pairs organized into triplets. Genome see if the 23rd is male or female. Male and female ovum environmental influences as monozygotic twins. Dominant gene is far more influential than the recessive gene. Dominant gene can completely control the phenotype with no noticeable effect of. Effect of recessive genes can sometimes be noticed. Carrier person whose genotype includes a gene that is not expressed in the phenotype unexpressed gene occurs in half of the carrier"s gametes and is passed on offspring can be carrier or express the gene in the phenotype. Dominant-recessive heredity recessive gene to half of the carrier"s offspring.
