Chromosomal Inheritance
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Chromosomal Inheritance
The chromosome theory of inheritance states that
17.1
Genes have specific loci (locations) on chromosomes Chromosomes undergo synapsis and crossing over Genes whose loci are nearby assort together
Linked genes tend to be inherited together because they are located near each other on the same chromosome
17.1
Recombinant Phenotypes
Phenotype Is
the physical appearance of a trait
Recombinant offspring Are
those that show new combinations of the parental traits
Determining
the number of recombinant offspring for traits tells us how closely genes are linked
17.2
Linkage Map
A linkage map Is
the actual map of a chromosome based on recombination frequencies
17.3
Determining Sex
In humans and other mammals
17.4
There are two varieties of sex chromosomes, X and Y
X
X
X
XX
XX
Y
XY
XY
Linked vs. Sex-linked
Sex linked genes are found on the sex chromosomes Linked genes have loci in close proximity They
may or may not be on a sex chromosome
17.5
Sex-linked Diseases in Males
17.6
Because the Y chromosome is smaller, males have only one allele for some genes If males inherit only one allele that causes a disorder they will have the disorder
Sex-Linked Disorders
Some recessive alleles found on the X chromosome in humans cause certain types of disorders Color
blindness Duchenne muscular dystrophy Hemophilia
17.7
The chromosome theory of inheritance states that
17.1
Genes have specific loci (locations) on chromosomes Chromosomes undergo synapsis and crossing over Genes whose loci are nearby assort together
Linked genes tend to be inherited together because they are located near each other on the same chromosome
17.1
Recombinant Phenotypes
Phenotype Is
the physical appearance of a trait
Recombinant offspring Are
those that show new combinations of the parental traits
Determining
the number of recombinant offspring for traits tells us how closely genes are linked
17.2
Linkage Map
A linkage map Is
the actual map of a chromosome based on recombination frequencies
17.3
Determining Sex
In humans and other mammals
17.4
There are two varieties of sex chromosomes, X and Y
X
X
X
XX
XX
Y
XY
XY
Linked vs. Sex-linked
Sex linked genes are found on the sex chromosomes Linked genes have loci in close proximity They
may or may not be on a sex chromosome
17.5
Sex-linked Diseases in Males
17.6
Because the Y chromosome is smaller, males have only one allele for some genes If males inherit only one allele that causes a disorder they will have the disorder
Sex-Linked Disorders
Some recessive alleles found on the X chromosome in humans cause certain types of disorders Color
blindness Duchenne muscular dystrophy Hemophilia
17.7
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