L05 chapter 4

L05 chapter 4 - Genetics Bio 2306 Ch 4: Sex Determination...

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1 Genetics Bio 2306 Ch 4: Sex Determination and Sex-Linked Traits
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3 Sex Determination What is the fundamental difference between males and females? Size of gametes Males produce small gametes Females produce large gametes
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4 monoecious - “one house” one individual produces both male and female gametes dioecious - “two houses” separate sexes - one individual produces only male or female gametes Sex Differences ** Sex chromosomes versus autosomes
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5 Sex Determining Systems 1. Chromosomal Sex Determination a. XX, XY System female is XX (homogametic sex) male is XY (heterogametic sex)
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7 How does an X and Y chromosome pair during meiosis?
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8 b. XX, XO System female is XX (homogametic sex) male is XO (single X) (heterogametic sex) grasshoppers
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9 c. ZZ, ZW System male is ZZ (XX) homogametic sex female is ZW (XY) heterogametic sex common in birds
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10 d. Haplodiploidy no sex chromosomes; sex based on # of chromosome sets female is diploid (2N) - develops from fertilized egg male is haploid (1N) - develops from unfertilized egg bees, wasps, ants
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12 Environmental Sex Determination Sex determined by environmental factors ex: slipper limpet
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13 Sex Determination in Drosophila XX, XY sex determination Sex determined by ratio of number of X chromosomes to number of haploid sets of autosomes (non sex chromosomes) X:A Ratio
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L05 chapter 4 - Genetics Bio 2306 Ch 4: Sex Determination...

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