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Chapter 15: The Chromosomal Basis of Inheritance
Terms in this set (25)
chromosome theory of inheritance
Mendelian genes have specific loci (positions) along chromosomes, and it is the chromosomes that undergo segregation and independent assortment
The phenotype for a character most commonly observed in natural populations
A gene located on either sex chromosomes
Duchenne muscular dystrophy
A human X-linked disorder that is characterized by a progressive weakening of the muscles and loss of coordination.
An X-linked recessive disorder defined by the absence of one or more the proteins required for blood clotting
The inactive X in each cell of a female condenses into a compact object which lies along the inside of the nuclear envelope
Genes located near each other on the same chromosome tend to be inherited together in genetic crosses. Linked genes are referring to two or more genes on the same chromosomes that tend to be inherited together
The production of the offspring with combinations of traits that differ from those found in either parent
The offspring are expected to inherit a phenotype that matches either of the parental (P generation) phenotype
The offspring have new combinations of seed shape and color
A process that occasionally breaks the physical connection between specific alleles of genes on the same chromosome, accounts for the recombination of linked genes.
an ordered list of the genetic loci along a particular chromosome
A genetic map based on recombination frequencies
The distance between genes
Locate genes with respect to chromosomal features that can be seen in microscopes
In which the members of a pair of homologous chromosomes do not move apart properly during meiosis I r sister chromatids fall to seperate during meiosis II
If either of the aberrant gametes unites with a normal one at fertilization the zygote will also have an abnormal number of a particular chromosome
Fertilization involving a gamete that has no copy of a particular chromosome will lead to a missing chromosomes in the zygote
If a chromosome is present in triplicate in the zygote, so that the cell has 2n + 1 chromosome the aneuploid cell is trisomic for that chromosome `
Some organisms have more than two complete chromosome sets in all somatic cells.
A deletion occurs when a chromosomal fragment is lost.
An aberration in chromosome structure due to fusion with a fragment from homologous chromosome, such as that a protein of a chromosome is duplicated
A chromosomal fragment may also reattach to the original chromosome but in the reverse orientation
A possible result of chromosomal breakage is for the fragement to join a nonhomologous chromosome
A variation in the phenotype that depends on whether an alele is inherited from the male or female parent
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