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CH12

biology 1301

QuestionAnswer
Linked genes are genes that do not sort independently due to their being physically near each other on the same chromosome.
If two genes are linked on the same chromosome, then the closer they are to each other the less crossing over occurs between them
When two genes on the same chromosome are located 10 map units from each other, ____ of the offspring from a test cross for genetic linkage should have a recombinant phenotype. about 10%
When two genes are located on different chromosomes, ____ of the offspring from a test cross for genetic linkage should have a recombinant phenotype about 50%
Genetic map units represent relative positions of genes with respect to each other.
Which process generally is the cause for production of recombinant offspring for two genes on the same chromosome crossing-over between homologous chromosomes
The discovery of sex-linked genes and production of the first chromosome map came from studies of fruit flies
Sex-linked genes are genes that are located on sex chromosomes.
In humans, sex determination generally depends upon whether or not the Y chromosome is present
An autosome is a chromosome that is part of a pair that is the same in both males and females
In humans, normally if ____ then the SRY gene switches development toward ____ at an early point in embryonic development. a Y chromosome is present; maleness
An individual who is a carrier of a genetically inherited disease does not have the disease but may have offspring with the disease.
If you see a male calico cat, you can be fairly certain that his diploid cells have a sex chromosome combination of ____. XXY
True or false: inversions and translocations are lethal if they occur False
Failure of homologous pairs or sister chromatids to separate during meiosis is called Nondisjunction
Individuals with extra or missing copies of some of their chromosomes are called ____ aneuploids
In cells of human individuals with three or more X chromosomes one X chromosome remains active and the rest are inactivated.
Carriers for sickle-cell disease have a genetic advantage in some situations over those who do not have any copies of the sickle-cell allele because carriers have increased resistance to malaria
Created by: TejasRanger29
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