Low environmental effect High environmental effect 2 2 Seed weight Seed weight (a) Ww x Ww Low environmental effect www www 15 www WWW 20 www www www www www wwW 15 www www www wwW 6. 6. Seed weight Number of individuals High environmental effect www www www wwW 6. www www 15 www Www 20 www www wwW www www www 15 6. 1 Seed weight (b) www www x WwW www Number of individuals

Human Anatomy & Physiology (11th Edition)
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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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How genotypes and phenotypes may overlap for quantitative traits. (a) Situations in which seed weight is controlled by one gene, existing in light (w) and heavy (W) alleles. (b) Situations in which seed weight is governed by three genes instead of one, each existing in light and heavy alleles. (Note: The 1:2:1 and 1:6:15:20:15:6:1 ratios were derived by using a Punnett square and assuming a cross between individuals that are both heterozygous for one or three different genes, respectively.)

 

Explain how gene number and environmental variation affect the
overlaps between phenotypes and different genotypes

Low environmental effect
High environmental effect
2
2
Seed weight
Seed weight
(a) Ww x Ww
Low environmental effect
www www
15
www WWW
20
www www www www www wwW
15
www www www wwW
6.
6.
Seed weight
Number of individuals
Transcribed Image Text:Low environmental effect High environmental effect 2 2 Seed weight Seed weight (a) Ww x Ww Low environmental effect www www 15 www WWW 20 www www www www www wwW 15 www www www wwW 6. 6. Seed weight Number of individuals
High environmental effect
www www www wwW
6.
www www
15
www Www
20
www www wwW www www www
15
6.
1
Seed weight
(b) www www x WwW www
Number of individuals
Transcribed Image Text:High environmental effect www www www wwW 6. www www 15 www Www 20 www www wwW www www www 15 6. 1 Seed weight (b) www www x WwW www Number of individuals
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