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Sex Determination and Sex-Linked TraitsChapter 4
Outline Sex Determination Different Karyotypes sry gene and malenessSex Linked Traits Barr Bodies
1. Chromosomal Sex determination SystemsXX-XO XX-XY ZZ-ZW Haplodiploidy
A closer look at 2 different systems of sex determination
2. Genetic Sex Determining SystemsGenic Balance Sex Determination Environmental Sex Determination drosophila Slipper limpet
Drosophila: genic balanceSex chromosome Autosome* complement X:A ratio Phenotype XX and AA 1.0 female Xy and AA 0.5 male XXY and AA XXX and AAA 0.67 intersex * autosome= any non-sex chromosome
Human Karyotypes Klinefelter Syndrome Non-disjunction NORMALTurner Syndrome
Maleness Determination of maleness is due to sry gene of Y chromosomeExpression of gender is more complex than just sry gene. Example: androgen insensitivity Xy genotype Many female characteristics!
Sex Linked (X-linked) Traits (3 examples)Human Color Blindness
Sex Linked (X-linked) TraitsWhite eye Drosophila
Pedigree of hemophiliaXhY x XHXh ½ XH ½ Xh ¼ XHXh ¼ XhXh ½ Xh ½ Y ¼ XHY ¼ XhY
Barr Bodies & X-InactivationWhat are they? Why does it occur?
Number of Barr Bodies in Human Cells
X-Inactivation in catsTortoiseshell Color
Y-Linked Inheritance Few genes on Y chromosomesFew examples of known Y linked traits to date
Patterns of Chromosome Inheritance
Human Genetics It’s all in the….
Warm-up What do you already know about chromosomes? Tell me at least one thing!
Karyotypes and Sex-Linked Traits
Two copies of each autosomal gene affect phenotype.
Chromosomal Inheritance and Human Sex Determination
KEY CONCEPT A combination of methods is used to study human genetics.
Human Genetics EQ: How can genetic patterns be analyzed to determine dominant or recessive inheritance patterns?
Sex Linked Traits Humans have 23 pairs of chromosomes.
Chapter 24: Patterns of Chromosome Inheritance
Chapter 14: The Human Genome
Human Heredity: The genetic transmission of characteristics from parent to offspring.
Heredity Study Guide Answer Key.
Inheritance Patterns and Human Genetics. Sex Chromosomes and Autosomes Sex Chromosomes contain genes that determine the gender of an individual. Many.
KARYOTYPE TESTS. KARYOTYPE = Image of all the chromosomes from the nucleus of a cell Can be done to identify genetic disorders.
1 Sex Determination and Sex-linked Genes Genes located on X or Y chromosomes behave differently than autosomal genes. Reciprocal crosses distinguish between.
Sex-Linked Traits Chapter 4.1. Answers to Questions 1. What are sex-linked traits? - Human traits that are carried on the sex chromosomes. 2. What’s a.
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