A purple flowering, smooth seed dihybrid plant (genotype PpSs) is test crossed with a white flowering,...
A purple flowering, smooth seed dihybrid plant (genotype PpSs) is test crossed with a white flowering, wrinkled seed plant (genotype ppss). These produce progeny in the following numbers of four phenotypes: 24:76:74:26 (purple flower + smooth seed coat: purple flower + wrinkled seed coat: white flower + smooth seed coat: white flower + wrinkled seed coat).
a) Explain how ratios of progeny show that the two genes are linked.
b) How many map units separate the colour and seed coat genes? Show your calculations.
Homework Answers
PpSs*ppss
| PS | Ps | pS | ps | |
| ps | PpSs (purple flower, smooth seed coat) | Ppss (purple flower wrinkled seed coat) | ppSs (white flower, smooth seed coat) | ppss(white flower, wrinkled seed coat) |
if the genes are not linked the
ratio expected is
purple flower, smooth seed coat: purple flower wrinkled seed coat: white flower, smooth seed coat: white flower, wrinkled seed coat=1:1:1:1
the observed ratio is
purple flower, smooth seed coat: purple flower wrinkled seed coat: white flower, smooth seed coat: white flower, wrinkled seed coat= 24:76:74:26 = 1:3.2:3.1:1.08 ( to simplify the ratio divide all numbers with 24)
this ratio deviates from the expected ratio, the deviations are large so the genes are linked.
b) recombination frequency= number of recombinant progenies/total number of progenies* 100
recombination frequency is the percentage of recombinant progenies, the maximum possible recombination frequency is obtained when genes are not linked then number of recombinant progenies = number of parental type progenies, if the genes are linked the recombination frequency is less than 50% so number of recombinant progenies is less than the number of the parental type progenies so the recombinant progenies are purple flower smooth seed coat and white flower, wrinkled seed coat.so
recombination frequency= number of purple flowers, smooth seed coat+ number of white flower, wrinkled seed coat/ total number of progenies*100
=( 24+26)/200*100
= 0.25*100
= 25%
so the genes are separated by 25 map units.
Add Answer to:
A purple flowering, smooth seed dihybrid plant (genotype PpSs)
is test crossed with a white flowering,...
A purple flowering, smooth seed dihybrid plant (genotype PpSs)is test crossed with a white flowering, wrinkled...
A purple flowering, smooth seed dihybrid plant (genotype PpSs)is test crossed with a white flowering, wrinkled seed plant(genotype ppss).These produce progeny inthe following numbers of four phenotypes:24:76:74:26 (purple flower + smooth seed coat: purple flower + wrinkled seed coat: white flower + smooth seed coat: white flower + wrinkled seed coat). a)Explain how ratios of progeny show that the two genes are linked. b)How many map units separate the colour and seed coat genes? Show your calculations.
Complete a dihybrid cross between a pea plant (plant 1) with white flowers and wrinkled seeds...
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2. A purple-flowering plant (PP) is crossed to a white-flowering plant (pp). A. Using a Punnett...
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17. A diploid plant is a dihybrid for flower color (gene “R”)
and leaf size (gene “L”). Its
phenotype is red flowers and large leaves. This plant is crossed to
a tester plant (which has
white flowers and small leaves). The progeny is as follows:
23 Red, large
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235 White, large
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A) Genes R and L are unlinked
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A pink flowering plant is of genotype RW. If two such plants are crossed, we obtain...
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In this tutorial you will examine dihybrid crosses: crosses where alleles at separate loci assort independently...
In this tutorial you will examine dihybrid crosses: crosses
where alleles at separate loci assort independently into gametes at
meiosis. You will also use logic to determine unknown genotypes,
phenotypes, and genetic ratios from given data.
Part A - Deducing phenotypes and genotypes of selfed parents
Mendel studied pea plants dihybrid for seed shape (round versus
wrinkled) and seed color (yellow versus green). Recall that
the round allele (R) is dominant to the wrinkled allele
(r) and
the yellow allele...
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Question 12 only.
Punnett's square analysis for the parental cross r Rr Rr 9) If we used the above offspring (F1) in a new cross, what would be the genotypes and phenotypes of the offspring of the Fz generation? 10) What is the genotypic ratio of the F2 generation? 11) What is the phenotypic ratio of the F2 generation? 12) What would be the genotypic and phenotypic ratios of offspring from a cross between a homozygous recessive parent (r r)...
17. A diploid plant is a dihybrid for flower color (gene “R”)
and leaf size (gene “L”). Its
phenotype is red flowers and large leaves. This plant is crossed to
a tester plant (which has
white flowers and small leaves). The progeny is as follows:
23 Red, large
25 White, small
230 Red, small
235 White, large
What can be concluded about the linkage relationship of the loci in
the dihybrid parent?
A) Genes R and L are unlinked
B)...
A pink-flowering plant is of genotype RW. If two such plants are crossed, we obtain a red plant (RR) with probability 0.15, a pink plant (RW or WR) with probability 0.68, and a white plant (WW) with probability 0.17, as shown in the table. What is the expected number of W genes present in a crossing of this type? The expected number of white genes (W) is (Type an integer or a decimal.)
A pink-flowering plant is of genotype RW. If two such plants are crossed, we obtain a red plant (RR) with probability 0.27, a pink plant (RW or WR) with probability 0.48, and a white plant (WW) with probability 0.25, as shown in the table. What is the expected number of W genes present in a crossing of this type? Number of W Genes Present X; Pi 0 0.27 0.48 2 0.25 1 The expected number of white genes (W) is...
Answer the following questions for the dihybrid cross described. In a plant blue flowers crossed with white flowers results in blue and white spotted. Additionally, broad leaves are more common even when crossed with thin. (A) What is the mode of inheritance of flower color? Cross: A (1) true breeding blue flower plant with broad leaves is crossed with a (2) blue and white spotted flower with thin leaves. (B) What is the genotype of the two parents involved in...
A pink flowering plant is of genotype RW. If two such plants are crossed, we obtain a red plant (RR) with probability 0.08, a pink plant (RW or WR) with probability 0.73, and a white plant (WW) with probability 0.19, as shown in the table. What is the expected number of W genes present in a crossing of this type? Number of W Genes Present P 0 0.08 0.73 2 0.19 The expected number of white genes (W) is (Type...
In this tutorial you will examine dihybrid crosses: crosses
where alleles at separate loci assort independently into gametes at
meiosis. You will also use logic to determine unknown genotypes,
phenotypes, and genetic ratios from given data.
Part A - Deducing phenotypes and genotypes of selfed parents
Mendel studied pea plants dihybrid for seed shape (round versus
wrinkled) and seed color (yellow versus green). Recall that
the round allele (R) is dominant to the wrinkled allele
(r) and
the yellow allele...
Question 12 only.
Punnett's square analysis for the parental cross r Rr Rr 9) If we used the above offspring (F1) in a new cross, what would be the genotypes and phenotypes of the offspring of the Fz generation? 10) What is the genotypic ratio of the F2 generation? 11) What is the phenotypic ratio of the F2 generation? 12) What would be the genotypic and phenotypic ratios of offspring from a cross between a homozygous recessive parent (r r)...
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