abbey garden came a theory of particulate inheritance that anchors modern geneti
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Question
abbey garden came a theory of particulate inheritance that anchors modern genetics. In the last section of this chapter, we will apply Mendelian genetics to human inheritance, with emphasis on the transmission of hereditary diseases. CONCEPT CHECK 14.3 Incomplete dominance and epistasis are both terms that define genetic relationships. What is the most basic dis- tinction between these terms? 1. 2. If a man with type AB blood marries a woman with type O, what blood types would you expect in their children? What fraction would you expect of each type? WHAT IF? the same phenotype produce 15 gray, 6 black, and 8 white chicks. What is the simplest explanation for the in- heritance of these colors in chickens? What phenotypes would you expect in the offspring of a cross between a gray rooster and a black hen? 3. A rooster with gray feathers and a hen of For suggested answers, see Appendix A 281 CHAPTER 14 Mendel and the Gene IdeaExplanation / Answer
1) Incomplete dominance explains the relationship between two alleles of a single gene, whereas epistasis relates to the genetic relationship between two genes with respective alleles of each type.
2) Type A: 50%
Type B: 50%
Half of the children would be expected to have type A blood and half type B blood.
AB = both A and B allele and O = neither A or B allele.
3) The black and white alleles are incompletely dominant, with heterozygous being gray in color; a cross in gray and black would yield equal black and gray.
In incomplete dominance Feather color is controlled by two genes B = black and b = white. The third phenotype is the result of a half - half mixing of black and white to produce gray.
The 15 gray, 6 black, and 8 white chicks represent a 2:1:1 ratio and emdash;the result of mating two heterozygous individuals: (Bb x Bb)
1 BB : 2 Bb : 1 bb
A gray rooster (Bb ) mated to a black hen (BB ) can be represented by the following Punnett square:
50% of the offspring should be gray (Bb ) and 50% black (BB ).
Male / Female B b B BB Bb b Bb bbRelated Questions
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