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Chapter 15 Notes

by: Caroline Picciolo

Chapter 15 Notes BSC 1010C

Caroline Picciolo

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These notes cover chapter 15
General Biology
Professor Palmtag
Class Notes
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This 2 page Class Notes was uploaded by Caroline Picciolo on Thursday February 11, 2016. The Class Notes belongs to BSC 1010C at Florida Gulf Coast University taught by Professor Palmtag in Winter 2016. Since its upload, it has received 14 views. For similar materials see General Biology in Biological Sciences at Florida Gulf Coast University.

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Date Created: 02/11/16
Chapter 15: The Chromosomal Basis of Inheritance  Inheritance of sex-linked genes o This pair is hemizygous, Y chromosome lacks many genes o Sex linked genes  A gene located on either sex chromosome  X chromosome contains about 2,000 genes  Y chromosome  Known to have 78 genes, some of which are homologous to the X o Sex-linked genes in humans  Refers to genes on the X-sex chromosome, which are not found on the Y sex chromosome  Fathers pass their sex-linked genes to all of their daughters but to none of their sons  Males can only receive a sex-linked gene from their mother  Mothers pass sex-linked alleles to both sexes  X inactivation in female mammals o Females inherit two X chromosomes o One X chromosome inactivates and forms what is called a Barr body  It condenses and lies inactive along the nuclear envelope o Every female is a mosaic of cells, each featuring only one of the two X chromosomes  The X – O system o Many insects o X is the only type of sex chromosome o Female are XX, males are XO  The Z-W system o In some birds, fishes, and insects o Sex chromosome is present in the egg determine the sex o Females are ZW, males are ZZ  The haplo-diploid system o Most bees and ants Chapter 15: The Chromosomal Basis of Inheritance o No sex chromosomes o Females developed from fertilized eggs, males develop from unfertilized eggs  Linked genes tend to be inherited together o Linked genes  Located on the same chromosome, tend to be inherited together  What does this mean?  Inheritance of these genes will not follow the same patterns as we would expect according to Mendel’s law of independent assortment  Crossing over in Meiosis I will also affect the outcome of inheritance for genes found on the same chromosome


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