1 Dextral, a right-handed coil, results from an autosomal allele (s*) that is dominant... P generation Dextral O Sinistral Y ...over an allele for sinistral (s), which encodes a left-handed coil. stst Meiosis Gametes (st Fertilization F, generation Sinistral 3 All the F1 are heterozygous (sts); because the genotype of the mother determines the phenotype of the offspring, all the F1 have a sinistral shell. sts Meiosis Self-fertilization F2 generation Dextral Dextral Dextral 4 stst 2 sts 4 s nclusion: Because the mother of the F2 progeny 5 genotype s+s, all the F2 snails are dextral. re 5.17 tics: A Conceptual Approach, Sixth Edition 17 W. H. Freeman and Company
1 Dextral, a right-handed coil, results from an autosomal allele (s*) that is dominant... P generation Dextral O Sinistral Y ...over an allele for sinistral (s), which encodes a left-handed coil. stst Meiosis Gametes (st Fertilization F, generation Sinistral 3 All the F1 are heterozygous (sts); because the genotype of the mother determines the phenotype of the offspring, all the F1 have a sinistral shell. sts Meiosis Self-fertilization F2 generation Dextral Dextral Dextral 4 stst 2 sts 4 s nclusion: Because the mother of the F2 progeny 5 genotype s+s, all the F2 snails are dextral. re 5.17 tics: A Conceptual Approach, Sixth Edition 17 W. H. Freeman and Company
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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
Transcribed Image Text:1 Dextral, a right-handed coil, results from
an autosomal allele (s*) that is dominant...
P generation
Dextral O
Sinistral ?
...over an allele
for sinistral (s),
which encodes
a left-handed coil.
stst
SS
Meiosis
Gametes
Fertilization
F, generation
Sinistral
3 All the F1 are heterozygous
(sts); because the genotype
of the mother determines the
phenotype of the offspring,
all the F1 have a sinistral shell.
sts
Meiosis
Self-fertilization
F2 generation
Dextral
Dextral
Dextral
4 sts+
2 sts
4 s
Conclusion: Because the mother of the F2 progeny
has genotype sts, all the F, snails are dextral.
Figure 5.17
Genetics: A Conceptual Approach, Sixth Edition
© 2017 W. H. Freeman and Company
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