lec06 - Lecture 6 Sex linkage I Xlinked inheritance A...

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Picture 12 Picture 15 Lecture 6 – Sex linkage I. X-linked inheritance A.  Drosophila white  gene behaves oddly  so why is this unusual? B. Is white restricted to males? 1
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Picture 17 Picture 18 Picture 19 Picture 39 Picture 38 C. Is it a new pattern of inheritance? D. Characteristics of X-linked inheritance 1. Reciprocal crosses may  result in different  phenotypic ratios between sexes. 2
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Picture 40 Picture 30 2. Heterozygous females transmit mutation to 1/2 their sons 3. Males that inherit X-linked recessive display mutant phenotype because Y doesn’t  carry the gene.  E. X-linkage strongly supports chromosomal theory of  inheritance.  prediction based observed  on genetics karyotype 1/4 red-eyed female 1/4 red-eyed male 1/4 white-eyed female 1/4 white-eyed male 3
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II. Sex chromosomes A. Sex chromosomes differ between sexes - autosomes are B. Types of sex chromosomes: 1. X chromosome: 2. Y chromosome:
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