The Chromosome Theory of Inheritance
Freeman Chapter 13
Terms in this set (21)
physical location of a particular gene on a chromosome
what is responsible for Mendel's principle of segregation?
the physical separation of alleles during anaphase of meiosis I
what is responsible for Mendel's principle of independent assortment?
if the alleles for different genes are located on different non homologous chromosomes, they assort independently of one another at meiosis I
chromosome theory of inheritance
the principle that genes are located on chromosomes and that patterns of inheritance are determined by the behavior of chromosomes during meiosis... essentially explained by the independent alignment and separation of homologs at meiosis I
what is the Drosophila melanogaster?
a fruit fly that has been at the center of genetic studies
the most common phenotype seen in a population; especially the most common phenotype in wild populations compared with inbred strains of the same species... in Drosophila, red eyes are the wild type
a change in a gene (hereditary information) of an organism... organisms with these traits are called "mutants"
do X & Y chromosomes pair during prophase of meiosis I?
yes, even though they contain different genes, they have regions that are similar enough to lead to proper pairing during this phase of meiosis I
what is the sex of an "XX" individual?
what is the sex of an "XY" individual?
half the gametes produced by a male carry __ and the other half carry __ (sex chromosomes)
X and Y
X-linked inheritance (X-linkage)
inheritance patterns for genes located on the mammalian X chromosome
Y-linked inheritance (Y-linkage)
inheritance patterns for genes located on the mammalian Y chromosome
hypothesis of X-linkage
a female has two copies of the X-linked gene that specifies a particular trait because she has two X chromosomes and a male only has one copy of the particular gene because he has only one X chromosome, inherited from his mother
sex-linked inheritance (sex linkage)
inheritance patterns observed in genes carried on sex chromosomes, so females and males have different numbers of alleles of a gene and may pass its trait only to one sex of offspring
what would be the phenotype of a X^W,X^W individual? (fruit fly example from book... W indicated red eyes and w indicated white eyes)
what would be the phenotype of a X^w,Y individual?
what would be the phenotype of an X^w,X^w individual?
what would be the phenotype of an X^W,Y individual?
genes on non-sex chromosomes show this type of inheritance
X-linked inheritance convinced most biologists that the chromosome theory of inheritances was... (correct/incorrect)
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