Question

The type of inheritance where both alleles are partially expressed often producing an intermediate characteristic

Answer 1

Answer:

incomplete dominance

Explanation:

Answer 2

Explanation:

Incomplete dominance

Mendel’s results were groundbreaking partly because they contradicted the (then-popular) idea that parents' traits were permanently blended in their offspring. In some cases, however, the phenotype of a heterozygous organism can actually be a blend between the phenotypes of its homozygous parents.

For example, in the snapdragon, Antirrhinum majus, a cross between a homozygous white-flowered plant (C^WC^WC

start superscript, R, end superscript, C, start superscript, R, end superscript) will produce offspring with pink flowers (

C, start superscript, R, end superscript, C, start superscript, W, end superscript). This type of relationship between alleles, with a heterozygote phenotype intermediate between the two homozygote phenotypes, is called incomplete dominance.

Diagram of a cross between $C^WC^W$ (red) and $C^RC^R$ (white) snapdragon plants. The F1 plants are pink and of genotype $C^RC^W$.

W

C

W

C, start superscript, W, end superscript, C, start superscript, W, end superscript (red) and C^RC^RC

R

C

R

C, start superscript, R, end superscript, C, start superscript, R, end superscript (white) snapdragon plants. The F1 plants are pink and of genotype C^RC^WC

R

C

W

C, start superscript, R, end superscript, C, start superscript, W, end superscript.

We can still use Mendel's model to predict the results of crosses for alleles that show incomplete dominance. For example, self-fertilization of a pink plant would produce a genotype ratio of 111 C^RC^RC

R

C

R

C, start superscript, R, end superscript, C, start superscript, R, end superscript ::colon 222 C^RC^WC

R

C

W

C, start superscript, R, end superscript, C, start superscript, W, end superscript ::colon 111 C^WC^WC

W

C

W

C, start superscript, W, end superscript, C, start superscript, W, end superscript and a phenotype ratio of 1:2:11:2:11, colon, 2, colon, 1 red:pink:white. Alleles are still inherited according to Mendel's basic rules, even when they show incomplete dominance.

Self-fertilization of pink $C^RC^W$ plants produce red, pink, and white offspring in a ratio of 1:2:1.

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