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Definition
| sexual reproduction creates unique combo's of genes. |
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Term
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Definition
-independent assortment
- random fertilization of genes.
unique phenotypes may give reproduction advantages to organisms.
( Independent Assortment) |
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Term
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Definition
| the exchange of chromosomes segmebts between homologous chromosomes; occurs in Meiosis 1 first part; results in new combos of genes. increases genetic diversity |
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Definition
| Crossing over can recombine gene loci on homologous chromosomes. This is unlikely to happen when the genes are close together. Crossing over is more likely to recombine alleles when the genes are far apart. |
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Term
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Definition
| genes located close together on a chromosomes tend to be inherited together. |
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Term
| genetic linkage and crossing over |
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Definition
| chromosomes contain many genes. The farther apart two genes are located on a chromosome, the more likely they are to be separated when crossing over. |
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Term
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Definition
| a gene located on any of the autosomal chromosomes 1-22. Two copies of each autosomal gene affect phenotype. |
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Term
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Definition
| Mendel's rules of inheritance apply to autosomal genetic disorders. Disorders caused by dominant alleles are uncommon. |
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Definition
| a heterozygote for a recessive disorder. |
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Term
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Definition
genes of sex chromosomes (23).
y- responsible for male characteristics
x- affects many traits |
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Term
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Definition
| all of a males sex-linked genes are expressed , and have no second copy of sex-linked genes. |
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Term
| female mammals xx genotype |
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Definition
| expression of sex-linked genes is similar to autosomal genes in females. X chromosome in activation randomly turns off x chromosome. |
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Definition
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Term
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Definition
| sex-linked disorders are disorders that are inherited as sex-linked (x linked) recessive traits. |
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Term
| sex-linked disorder scenario |
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Definition
| If a human male inherits the sex-linked recessive allele from his mom, the allele will be expressed- whereas females must inherit 2 alleles to exhibit the traits. |
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