It was later discovered in Cliff Tabin’s lab that a gene called Bmp4 involved in cell-cell signaling during beak development is partly responsible for beak depth in ground finches (Abzhanov et al., 2004). Alleles that increase Bmp4 expression increase the depth of the beaks, and were most likely selected for during the drought in 1977 (Abzhanov et al., 2004). In 2001, ground finches were collected from Daphne major and genotypes were analyzed at this particular locus. PhenotypeGenotypeNumber of IndividualsObserved Genotype FrequencyLow Bmp4 expressionAA491?Low Bmp4 expressionAa336?High Bmp4 expressionaa552? In 2009, allele frequencies were measured again on Daphne major for this particular gene. PhenotypeGenotypeNumber of IndividualsObserved Genotype FrequencyLow Bmp4 expressionAA706?Low Bmp4 expressionAa493?High Bmp4 expressionaa129?

The principle of genetic equilibrium states that relative frequencies of various kind of genes in a…

Answered: It was later discovered in Cliff…

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Author:Elaine N. Marieb, Katja N. Hoehn

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Chapter1: The Human Body: An Orientation

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It was later discovered in Cliff Tabin’s lab that a gene called Bmp4 involved in cell-cell signaling during beak development is partly responsible for beak depth in ground finches (Abzhanov et al., 2004). Alleles that increase Bmp4 expression increase the depth of the beaks, and were most likely selected for during the drought in 1977 (Abzhanov et al., 2004). In 2001, ground finches were collected from Daphne major and genotypes were analyzed at this particular locus.

Phenotype	Genotype	Number of Individuals	Observed Genotype Frequency
Low Bmp4 expression	AA	491	?
Low Bmp4 expression	Aa	336	?
High Bmp4 expression	aa	552	?

In 2009, allele frequencies were measured again on Daphne major for this particular gene.

Phenotype	Genotype	Number of Individuals	Observed Genotype Frequency
Low Bmp4 expression	AA	706	?
Low Bmp4 expression	Aa	493	?
High Bmp4 expression	aa	129	?