7.1.5 Autosomal Linkage

• In independent assortment, genes are located on the same chromosome.

  False
• Where are linked genes located?

  On the same chromosome
• Linked genes are located on the same chromosome
• The genotype of an organism always reveals its full phenotype.

  False
• Match the trait with its description:

  Dominant ↔️ Masks the recessive allele

  Recessive ↔️ Expressed only if no dominant allele present
• An organism's genetic makeup is its genotype
• Genes in sex-linked linkage are located on the sex chromosomes.
• In independent assortment, genes are located on different chromosomes.
• The observable physical or biochemical trait of an organism is its phenotype
• The genotype for a recessive trait requires two recessive alleles.
• What does recombination frequency measure?

  Likelihood of gene inheritance
• Autosomal linkage follows Mendelian inheritance principles.


  True
• 1 cM corresponds to a 1% chance of recombination between genes.


  True
• Recombination rates increase with age in many species
• What does autosomal linkage contrast with in inheritance patterns?

  Independent assortment
• What are the versions of genes called that determine different traits?

  Alleles
• An organism's phenotype always reveals its full genotype.

  False
• Sex-linked traits follow the principles of Mendelian inheritance.

  False
• Match the concept with its description:

  Recombination Frequency ↔️ Likelihood of genes being inherited together

  Genetic Maps ↔️ Using recombination frequencies to determine gene positions
• What reduces the likelihood of new combinations in autosomal linkage?

  Physical proximity
• Linked genes have a high recombination frequency compared to unlinked genes

  False
• Autosomal linkage reduces the likelihood of new combinations
• Genetic maps measure the distance between genes in centiMorgans
• Recombination rates generally increase with age
• In autosomal linkage, genes are located on the same chromosome
• Understanding autosomal linkage is crucial in genetic counseling
• Autosomal linkage contrasts with the principle of independent assortment
• Linked genes do not follow the principle of independent assortment
• How does autosomal linkage affect inheritance patterns?

  Genes on the same autosome are inherited together
• What is the role of a dominant allele?

  Masks the recessive allele
• An organism with two recessive alleles has the genotype dd
• What are the different versions of genes called?

  Alleles
• Where are genes located in autosomal linkage?

  Autosomes
• What happens to genes located on the same autosome during autosomal linkage?

  Inherited together
• What type of allele masks the expression of a recessive allele?

  Dominant
• What is the relationship between dominant and recessive alleles in inheritance?

  Dominant masks recessive
• Sex-linked linkage affects the inheritance of traits such as color blindness
• The distance between genes on a genetic map is measured in centiMorgans
• Factors influencing recombination rates:

  1️⃣ Distance between genes

  2️⃣ Age

  3️⃣ Sex

  4️⃣ Temperature

  5️⃣ Radiation
• Autosomal linkage reduces the likelihood of new combinations in offspring.


  True