In mice, the spinning behavior is caused by a dominant gene that affects the mouse’s equilibrium. This gene is lethal if two alleles are present. Two “spinning mice” are mated together. What are the phenotypes of the offspring and in what proportion?

A man with AB blood is married to a woman with AB blood. What blood types will their children be and in what proportion?

Hunting reduced Northern elepnat seals population size to as few as 20 individuals at the end of the 19th century. Their population has since rebounded to over 30,000—but they have much less genetic variation than a population of southern elephant seals that was not so intensely hunted. This is an example of  

In Cape population of South Africa, a Chinese immigrant known as Arnold had a very rare dominant mutation that causes teeth to fall out before age 20. Arnold had seven wives and of his 356 living descendants, 70 have the dental disorder.  1. Is this a case of random or non-dam mating? 2. If the children with the dental disorder have preference than normal children for marriage, predict what would be the allele frequency of this dental disorder few generations down the road? (i.e. will it increase or decrease ?)

Bacteria that become resistant to antibiotics by mutation or by acquiring resistance factors from other bacteria selectively survive in the presence of antibiotics. This is an example of natural selection.

Which of the following represents the proportion of individuals within a population that have heterozygous genotype?

Incomplete dominance describes an allele combination in which the heterozygous phenotype is intermediate between those of the two homozygotes (for example, pink flowers are intermediate between red flowers and white flowers). The dominant allele does not completely mask the recessive allele.

The term that is used to describe the severity or extent of a phenotype in an individual is called expressivity

Farmers have cultivated numerous popular crops, as shown in the figure, from the wild mustard, by_______________for certain attributes.

A geneticist crosses a plant with red flowers to a plant with white flowers. The offspring include plants with red flowers (1/4), pink flowers (1/2), and white flowers (1/4). Which allele is dominant?