This is easily recognized when the phenotype is somewhere between two extremes. Counting the parents, there are three phenotypes (black, white, grey) being expressed in these flowers instead of only two, and that third phenotype is intermediate between the other two. This heterozygous condition is called incomplete dominance. 1. On the chart you did earlier, which of the three hair types (wavy, curly, or straight) represents incomplete dominance-the blended heterozygous condition? 2. You cross a herd of red cattle with white cattle and all of the calves appear to be roan (reddish white). Is this an exa dominance? le of incomplete How do you know? 3. You cross a blue flowering pea plant with a white flowering pea plant and all of the offspring are blue flowered. Is this an example of incomplete dominance? How do you know?

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Genetics
181
Rule of Incomplete Dominance
When two different pure-breeding strains are crossed,
and their offspring show a blending of phenotypes,
then neither allele is dominant.
This is easily recognized when the phenotype is somewhere between
two extremes. Counting the parents, there are three phenotypes (black,
white, grey) being expressed in these flowers instead of only two, and that
third phenotype is intermediate between the other two. This heterozygous
condition is called incomplete dominance.
1. On the chart you did earlier, which of the three hair types (wavy,
curly, or straight) represents incomplete dominance-the blended
heterozygous condition?
2. You cross a herd of red cattle with white cattle and all of the calves
appear to be roan (reddish white). Is this an example of incomplete
dominance?
How do you know?
3. You cross a blue flowering pea plant with a white flowering pea plant
and all of the offspring are blue flowered. Is this an example of
incomplete dominance?
How do you know?
Transcribed Image Text:Genetics 181 Rule of Incomplete Dominance When two different pure-breeding strains are crossed, and their offspring show a blending of phenotypes, then neither allele is dominant. This is easily recognized when the phenotype is somewhere between two extremes. Counting the parents, there are three phenotypes (black, white, grey) being expressed in these flowers instead of only two, and that third phenotype is intermediate between the other two. This heterozygous condition is called incomplete dominance. 1. On the chart you did earlier, which of the three hair types (wavy, curly, or straight) represents incomplete dominance-the blended heterozygous condition? 2. You cross a herd of red cattle with white cattle and all of the calves appear to be roan (reddish white). Is this an example of incomplete dominance? How do you know? 3. You cross a blue flowering pea plant with a white flowering pea plant and all of the offspring are blue flowered. Is this an example of incomplete dominance? How do you know?
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