Lecture 9

Lecture 9 - homologues separated the resulting cells were...

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Lecture 9 – Inheritance Review: Homologues separate in Meiosis I Sister chromatids separate in Meiosis II Green part of moss is haploid Meiosis only makes one functional egg, where it makes four sperm (midpiece has mitochrondria) o In females, that one egg gets the majority of the cytoplasm o DNA in zygote is found in nuclei and in the mitochondria (mainly from the mom) Polar bodies – cells produced in females that are not used Twins Amy and Anna, Anna was twice as big as Amy, the hospital said they were identical, (monozygotic) Anna had a different hair pattern than Amy. Amy’s blood type is B, Anna’s blood type is O. They think Amy is a fertilized polar body. Must be the sperm from the same secondary meiosis because sperm determines the gender. And the homologues (from the female) must have separated differently for Amy and Anna to be different. 1) If you knew where
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Unformatted text preview: homologues separated the resulting cells were genetically different, where chromatids separate the resulting cells are very similar. • Gregor Mendel o Genes & alleles – occur at the same place on the same chromosomes and carry the same traits There may be multiple alleles but you only get 2 o 2 alike alleles – homozygous (males are the exception because they only have one x) o 2 unalike alleles – heterozygous o Appearance – phenotype o Genes – genotypes o Recessive is expressed only when it is by itself O is recessive o Dominant is always expressed A and B blood types are co-dominant (they are both expressed) Enzyme glyolipid on RBC’s A B O • O is the absence of A or B • Rh factor is the + or – in blood types o Positive is dominant o Negative is recessive o •...
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This document was uploaded on 10/26/2011 for the course BIOL 101 at UNC.

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