Lecture 17 Vocab

Front 1

linked genes

Back 1

genes that are on the same chromosome, and therefore tend to be inherited together

Front 2

sex-linked genes

Back 2

genes that are on the X or Y chromosome, and therefore show different patterns of inheritance than the autosomal genes

Front 3

linkage map

Back 3

map that shows the relative location of genes on a chromosome. it is determined based on the assumption that genes that are far apart on chromosomes will more often be separated during crossing over.

Front 4

map unit (aka centimorgan)

Back 4

a unit of a linkage map that corresponds to a 1% recombination frequency

Front 5

Barr body

Back 5

the inactivated X chromosome (in females only. this way, only 1 X chromosome is active in both males and females)

Front 6

translocation

Back 6

a segment of a chromosome is moved to a nonhomologous chromosome

Front 7

genomic imprinting

Back 7

when one allele is silenced during formation of gametes.

Front 8

extranuclear genes

Back 8

these genes are located in mitochondria and chloroplasts. they are inherited only from the mother, since the zygote's cytoplasm and organelles come from the egg cell.