Chapter 15 - Chromosome Inheritance

23 terms by Fawrkes

Create a new folder

Advertisement Upgrade to remove ads

Chromosome theory of inheritance

Mendelian genes ave specific loci on chromosomes, and it's the chromosomes that undergo segregation and independent assortment

Wild type

Normal phenotype for a character (most common in natural populations)

Sex-linked genes

Genes located on the sex chromosome

Linked genes

genes located on the same chromosome

Genetic recombination

Production of offspring with new combinations of traits inherited from two parents

Parental types

offspring that inherit a phenotype that matches one of the parental phenotypes

Recombinants

Offspring with new combinations of characters

Genetic map

ordered list of genetic loci along a particular chromosome

Linkage map

genetic map based on recombination frequencies

Map units

1% recombination frequency

Cytological maps

locate genes with respect to chromosomal features (locations)

Barr body

compact object (inactive X chromosome condenses to)

Nondisjunction

occaional mishap, members of homologous chromoses don't move apart properly during meiosis I : sister chromatids don't separate during meiosis II

Aneuploidy

Offspring having abnormal chromosome number

Trisomic

Chromosome present in triplicate (aneuploid cell)

Monosomic

Chromosome is missing

Polyploidy

Chromosome alteration

Deletion

Chromosmal fragment lacking a centromere is lost during cell division

Duplication

Fragment becoming attached as an extra segment to a sister chromatid

Inversion

Chromosomal fragment reattaching to the original chromosome (reverse orientation)

Traslocation

Fragment joins a nonhomologous chromosome

Genomic imprinting

A gene on one chromosome is silenced: allele on homologous chromose is free to be expressed

Fragile X syndrome

Physical appearance of abnormal X chromosome

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set