Biology
Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 23.3, Problem 3EQ
Summary Introduction

To determine:  The meaning of sexual selection with reference to experiments performed in figure 23.9 given in the text book.

Introduction: In 1998, Ole Seehausen and Jacques van Alphen investigated the role of sexual selection by performing experiments under two different light conditions. This was done to see sexual behavior in specific light conditions.

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Problem 2) Skin colour in dolphins is determined by a single gene showing incomplete dominance giving rise to 3 phenotypes Brown, Pink & White. A survey of a large population of dolphins was carried out and the phenotypes recorded. However a student who had some of the data stored on their phone fell overboard and unfortunately the data was lost. The only data saved was that the brown homozygotes (BB) were 59% of the population . a) What would be the percentage of pink heterozygotes and white homozygotes? b) What percentage of the gametes that give rise to the next generation of dolphins in this population will contain the white W allele?
Problem 2)  Skin colour in dolphins is determined by a single gene showing incomplete dominance giving rise to 3 phenotypes Brown, Pink & White. A survey of a large population of dolphins was carried out and the phenotypes recorded. However a student who had some of the data stored on their phone fell overboard and unfortunately the data was lost. The only data saved was that the brown homozygous dominants (BB) were 64% of the population .   a) What would be the percentage of pink heterozygotes and white homozygotes?
ALL WORKING MUST BE SHOWN Problem 3) Butterflies show 3 phenotypes due to incomplete dominance at the D locus with alleles D' and DB giving green phenotype in heterozygotes and yellow and blue in homozygotes a) A population of butterflies showed 49% yellow, and 51% blue and green. What percentage of the gametes for the next generation would contain the DB allele? b) In another population only 1% of the butterflies are blue, What is the DY allele frequency? c) If the butterflies were subject to predation by birds that could easily detect blue & yellow individuals what effect would you expect this to have on the genotype and allele frequencies over time? Indicate possible percentages.
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