Select from the terms below to answer questions #17-22.One term is not used.
R) Genomic imprinting
S) Methylation
T) Sex-influenced inheritance
U) Maternal inheritance
V) Sex-limited inheritance
W) Complementation
X) X-linked inheritance
Pattern baldness is controlled by two alleles: B, b.Females are bald if they are homozygous (BB) but males only needone allele B to be bald. This trait is an exampleof _________.
A mother passes on her mitochondrial genes to all of herchildren, and a father passes his mitochondrial genes to none ofhis children. This is an example of_________.
For some genetic disorders, the expression of thephenotype depends on whether an allele is inherited from the motheror father. An example in mice occurs with a gene for insulin-likegrowth factor II (Igf2): a heterozygous mouse will be dwarf if itsnormal allele comes from his mother and its mutant allelecomes from his father. This is an example of_________.
In chickens, a single pair of alleles controls thefeathering pattern of their neck and tail. Male chickens (roosters)may show cock or hen feathering; females (hens) only show henfeathering, never cock feathering. This is a case of_________.
Two recessive mutations that cause a “wingless†mutationin Drosophila are independently isolated. A researcher wonderswhether the mutations are in the same gene or different genes, sohe crosses the two strains. The outcome is that all offspringdevelop normal wings. Restoration of the wild-type phenotype isdue to _________.
It has been discovered that some hereditary traitsresult from changes in the pattern of gene expression withoutalterations to the DNA sequence. A major mechanismfor silencing gene expression is _________.
