CHAPTER 3 - 02:53 CHAPTER3 : phenotype; &1recessivegene

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02:53 CHAPTER 3 Dominant-Recessive pattern: 1 single dominant gene influences a persons  phenotype; but 2 recessive genes are necessary to produce an associated trait Homozygous – 2 dominant or 2 recessive genes Heterozygous – 1 dominant & 1 recessive gene If child receives 1 single dominant gene from 1 parent, child’s phenotype will  include trait determined by the dominant gene Child’s phenotype will include recessive trait only if inherits gene from both  parents. 3 Stages of Prenatal development: 1. Germinal: [Day1-14]: first 2 weeks o Sperm+ovum unite forming a zygote containing genetic information for  development of new human being o Zygote burrows into lining of uterus. Specialized cells become placenta,  umbilical cord, and embryo are formed. o Day 5- cells become  blastocyst  (fluid filled ball) o implantation : attachment of blastocyst to uterine wall(day 12) o placenta
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