handout 1.18.11 - 1/18/11 1. Sex-linked trait: Character...

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1/18/11 1. Sex-linked trait: Character that is encoded by a gene on the X chromosome (Z chromosome in birds and butterflies). 2. Homogametic: In species with different sex chromosomes, the sex that produces a single gamete type relative to the sex chromosomes (e.g., females in mammals). Heterogametic: The counterpart, then, is the sex that produces two gamete types relative to the sex chromosomes (e.g., males in mammals). 3. Hemizygous: Refers to having a single allele for a gene of a normal diploid individual (e.g., for a sex-linked gene of the heterogametic sex). 4. Karyotype: Chromosome complement of a cell, individual, or species 5. Mosaic: A chimera, an individual with a mixture of genetically different tissues --------------------------------------------------------------------------------------------------------------------------------------- CHROMOSOME THEORY Genes reside on chromosomes, and thereby, carry genes from cell to cell and generation to generation Evidence for: 1. Correlated behavior of genes and chromosomes (alleles and homologues come in pairs, segregate in meiosis, then re-pair in fertilization) 2. Chromosome mutations: Visually altered mutant chromosomes that are associated with specific mutant conditions, and thereby, specific genes 3. Sex chromosomes (X, Y): Naturally occurring, visually altered, normal chromosomes that are associated with specific traits, and thereby, specific genes ---------------------------------------------------------------------------------------------------------------------------------------
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This note was uploaded on 06/08/2011 for the course PCB 3063 taught by Professor Marta during the Spring '08 term at University of Florida.

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handout 1.18.11 - 1/18/11 1. Sex-linked trait: Character...

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