selves in the offspring. The crosses are lled ssed differently in homozy- heterozygous individuals. This produces a con- dition called incomplete dominance. In such cases, both worked out in the same manner as indicated previously, but heterozygous offspring exhibit a phenotype interme- diate between that of the homozygous individuals. Some examples follow. Activity 2 Working Out Crosses Involving Incomplete Dominance 1. The inheritance of flower color in snapdragons illustrates the principle of incomplete dominance. The geno-type RR is expressed as a red flower, Rr yields pink flowers, and rr produces white flowers. Work out the following crosses to determine the expected phenotypes and both genotypic and phenotypic percentages. % of each phenotype: 2. In humans, the inheritance of sickle cell anemia/trait is deter- mined by a single pair of alleles that exhibit incomplete domi- nance. Individuals homozygous for the sickling gene (s) have sickle cell anemia. In double dose (ss), the sickling gene causes production of a very abnormal hemoglobin, which crystallizes and becomes sharp and spiky under conditions of oxygen deficit. Heterozygous individuals (Ss) have the sickle cell trait; they make both normal and sickling hemoglobin. Usually these individuals are healthy, but prolonged decreases in blood oxygen levels can lead to a sickle cell crisis. Individuals with the genotype SS form normal hemoglobin. Work out the following crosses: a. Genotypes of parents: RR X rr % of each genotype: % of each phenotype: b. Genotypes of parents: Rr X rr a. Parental genotypes: SS × ss % of each genotype: 45 % of each genotype: % of each phenotype: % of each phenotype: b. Parental genotypes: ss X Ss C. Genotypes of parents: Rr X Rr % of each genotype: % of each genotype: % of each phenotype:
selves in the offspring. The crosses are lled ssed differently in homozy- heterozygous individuals. This produces a con- dition called incomplete dominance. In such cases, both worked out in the same manner as indicated previously, but heterozygous offspring exhibit a phenotype interme- diate between that of the homozygous individuals. Some examples follow. Activity 2 Working Out Crosses Involving Incomplete Dominance 1. The inheritance of flower color in snapdragons illustrates the principle of incomplete dominance. The geno-type RR is expressed as a red flower, Rr yields pink flowers, and rr produces white flowers. Work out the following crosses to determine the expected phenotypes and both genotypic and phenotypic percentages. % of each phenotype: 2. In humans, the inheritance of sickle cell anemia/trait is deter- mined by a single pair of alleles that exhibit incomplete domi- nance. Individuals homozygous for the sickling gene (s) have sickle cell anemia. In double dose (ss), the sickling gene causes production of a very abnormal hemoglobin, which crystallizes and becomes sharp and spiky under conditions of oxygen deficit. Heterozygous individuals (Ss) have the sickle cell trait; they make both normal and sickling hemoglobin. Usually these individuals are healthy, but prolonged decreases in blood oxygen levels can lead to a sickle cell crisis. Individuals with the genotype SS form normal hemoglobin. Work out the following crosses: a. Genotypes of parents: RR X rr % of each genotype: % of each phenotype: b. Genotypes of parents: Rr X rr a. Parental genotypes: SS × ss % of each genotype: 45 % of each genotype: % of each phenotype: % of each phenotype: b. Parental genotypes: ss X Ss C. Genotypes of parents: Rr X Rr % of each genotype: % of each genotype: % of each phenotype:
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:selves in the offspring. The crosses are
lled
ssed differently in homozy-
heterozygous individuals. This produces a con-
dition called incomplete dominance. In such cases, both
worked out in the same manner as indicated previously,
but heterozygous offspring exhibit a phenotype interme-
diate between that of the homozygous individuals. Some
examples follow.
Activity 2
Working Out Crosses Involving Incomplete Dominance
1. The inheritance of flower color in snapdragons illustrates
the principle of incomplete dominance. The geno-type RR
is expressed as a red flower, Rr yields pink flowers, and rr
produces white flowers. Work out the following crosses to
determine the expected phenotypes and both genotypic and
phenotypic percentages.
% of each phenotype:
2. In humans, the inheritance of sickle cell anemia/trait is deter-
mined by a single pair of alleles that exhibit incomplete domi-
nance. Individuals homozygous for the sickling gene (s) have
sickle cell anemia. In double dose (ss), the sickling gene causes
production of a very abnormal hemoglobin, which crystallizes
and becomes sharp and spiky under conditions of oxygen deficit.
Heterozygous individuals (Ss) have the sickle cell trait; they make
both normal and sickling hemoglobin. Usually these individuals
are healthy, but prolonged decreases in blood oxygen levels can
lead to a sickle cell crisis. Individuals with the genotype SS form
normal hemoglobin. Work out the following crosses:
a. Genotypes of parents: RR X rr
% of each genotype:
% of each phenotype:
b. Genotypes of parents: Rr X rr
a. Parental genotypes: SS × ss
% of each genotype:
45
% of each genotype:
% of each phenotype:
% of each phenotype:
b. Parental genotypes: ss X Ss
C. Genotypes of parents: Rr X Rr
% of each genotype:
% of each genotype:
% of each phenotype:
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