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TLS Online TPP Program
#Question id: 15191
#Unit 8. Inheritance Biology
Genes that control coat color in mammals represent some of the best early examples of genes with multiple alleles exhibiting different phenotypes. A classic example is the C gene in hamsters. Three of the known alleles of this gene are C, ck and ca. Each supplies a different amount of black pigment to the coat hair. The phenotypes of three different homozygous strains are as follows.
Based on the concepts of dominance, determine whether ck and ca were dominant or recessive alleles by crossing the true-breeding sepia hamsters to true-breeding black hamsters. From the resulting F1 progeny phenotype, what would be the ratio of F2 phenotype
TLS Online TPP Program
#Question id: 15190
#Unit 8. Inheritance Biology
The recessive mutant allele that causes cystic fibrosis is much more frequent in Caucasians population than in other world populations. Some scientists believe heterozygotes must have had a survival advantage during plagues such as cholera that occasionally swept through this population. What concept does this illustrate?
TLS Online TPP Program
#Question id: 15122
#Unit 8. Inheritance Biology
Which of the following is the best example of overdominance?
TLS Online TPP Program
#Question id: 15121
#Unit 8. Inheritance Biology
Which of the following examples would NOT be consistent with a gene dosage effect?
TLS Online TPP Program
#Question id: 15116
#Unit 8. Inheritance Biology
In a rare blood type referred to as the Bombay phenotype, individuals are unable to attach the A or B antigens to their red blood cells. Individuals that are homozygous recessive for gene "H" have the Bombay phenotype and their blood type is type "O" regardless of their ABO genotype. This is an example of what extension of Mendelian inheritance?
TLS Online TPP Program
#Question id: 15115
#Unit 8. Inheritance Biology
A semi lethal allele is an example of which of the following extensions of Mendelian genetics?