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Genetics
Honors Biology 9
15
Science
9th Grade
02/24/2016

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Term
genetic variation
Definition
sexual reproduction creates unique combo's of genes.
Term
How ?
Definition
-independent assortment
- random fertilization of genes.
unique phenotypes may give reproduction advantages to organisms.
( Independent Assortment)
Term
crossing over
Definition
the exchange of chromosomes segmebts between homologous chromosomes; occurs in Meiosis 1 first part; results in new combos of genes. increases genetic diversity
Term
Crossing over (location)
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.
Term
genetic linkage
Definition
genes located close together on a chromosomes tend to be inherited together.
Term
genetic linkage and crossing over
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.
Term
autosomal gene
Definition
a gene located on any of the autosomal chromosomes 1-22. Two copies of each autosomal gene affect phenotype.
Term
autosomal disorders
Definition
Mendel's rules of inheritance apply to autosomal genetic disorders. Disorders caused by dominant alleles are uncommon.
Term
carrier
Definition
a heterozygote for a recessive disorder.
Term
sex-linked genes
Definition
genes of sex chromosomes (23).
y- responsible for male characteristics
x- affects many traits
Term
male mammals xy genotype
Definition
all of a males sex-linked genes are expressed , and have no second copy of sex-linked genes.
Term
female mammals xx genotype
Definition
expression of sex-linked genes is similar to autosomal genes in females. X chromosome in activation randomly turns off x chromosome.
Term
sex linked cross
Definition
ex: fruit flies
Term
sex-linked disorders
Definition
sex-linked disorders are disorders that are inherited as sex-linked (x linked) recessive traits.
Term
sex-linked disorder scenario
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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