EBK BIOLOGY
5th Edition
ISBN: 9780100667976
Author: Maier
Publisher: YUZU
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Chapter 7, Problem 3GP
Summary Introduction
To describe:
The relationship between the allele P and p.
Introduction:
The allele is the form of a single gene present in an organism. The different combination of the alleles determines the genotype and
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In zucchinis there are two genes controlling flower colour. One gene determines if
pigment is produced or not (P = pigment, p = no pigment) and another gene controls
the colour of the pigment (O = orange, o=yellow). Which of the following
genotypes will produce Orange flowers?
a) Pp Oo & PP OO
b) pp Oo & pp 00
O c) pp oo & Pp oo & PP oo
1) In the plant Salvia, two genes determine the inheritance of flower colour. For one gene, P is the allele for
purple colour and p for pink. However, at least one dominant allele at the other locus is required for the colour to
be expressed, Plants with the genotype aa have white flowers. Write down all possible genotypes for
a) purple flowered
b) pink flowered
c) white flowers
d) which gene, A/a or P/p is the epistatic gene and which is the hypostatic gene?
e) What type of epistasis is this?
In a species of tree, seed color is determined by four independently
assorting genes: A, B, C, and D. The recessive alleles of each of these genes (a, b,
C, and d) produce abnormal enzymes that cannot catalyze a reaction in the
biosynthetic pathway for seed pigment.
This pathway is diagrammed as follows:
A
White precursor
Yellow ----Orange----- Red
---
Blue
When both red and blue pigments are present, the seeds are purple. Trees with
the genotypes Aa Bb Cc Dd and Aa Bb Cc dd were crossed.
(a) What color are the seeds in these two parental genotypes?
(b) What proportion of the offspring from the cross will have white seeds?
(c) Determine the relative proportions of red, white, and blue offspring from the
cross.
Chapter 7 Solutions
EBK BIOLOGY
Ch. 7 - What is the relationship between genotype and...Ch. 7 - Prob. 2LTBCh. 7 - Prob. 3LTBCh. 7 - Prob. 4LTBCh. 7 - Prob. 5LTBCh. 7 - Scientists have recently developed a process by...Ch. 7 - What is the physical basis for the independent...Ch. 7 - Prob. 8LTBCh. 7 - Prob. 9LTBCh. 7 - Prob. 10LTB
Ch. 7 - Prob. 1GPCh. 7 - Prob. 2GPCh. 7 - Prob. 3GPCh. 7 - Prob. 4GPCh. 7 - Pfeiffer syndrome is a dominant genetic disease...Ch. 7 - Prob. 6GPCh. 7 - A cross between a pea plant that produces round...Ch. 7 - Prob. 8GPCh. 7 - The allele BRCA2 was identified in families with...Ch. 7 - Two parents both have brown eyes, but they have...Ch. 7 - Prob. 2AAATBCh. 7 - Prob. 3AAATBCh. 7 - Prob. 1CTSCh. 7 - Prob. 2CTSCh. 7 - Prob. 3CTS
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- A mutation that breaks which of the following genes would be most likely to produce theanthocyanless phenotype of the green-stem Wisconsin Fast Plants (meaning no purple stems):PAL, CHS, C3H, FLS, or DFR? Explain your reasoning.arrow_forwardA researcher studied six independently assorting genes in a plant. Each gene has a dominant and a recessive allele: R black stem, r red stem; D tall plant, d dwarf plant; C full pods, c constricted pods; O round fruit, o oval fruit; H hairless leaves, h hairy leaves; W purple flower, w white flower From the cross (P1) RrDdccOoHhWw x (P2) RrddCcooHhww, determine: Note: RrDdccOoHhWw is one genotype. a. How many kinds of gametes can be formed by P1?b. How many genotypes are possible among the progeny of this cross?c. How many phenotypes are possible among the progeny?d. What is the probability of obtaining the RrDdccOohhww genotype in the progeny?e. What is the probability of obtaining a black, dwarf, constricted, oval, hairy, purple phenotype in the progeny?arrow_forwardBi and biiarrow_forward
- In snapdragons red flower colour (CR) is incompletely dominant to white flower colour (CW). The heterozygote has pink flowers. Normal broad leaves (LB) are incompletely dominant to narrow, grass-like leaves, (LN). The heterozygote has intermediate leaf width. If a red-flowered, narrow leaved snapdragon is crossed with a white-flowered broad leaved one, what will be the phenotypes in the F1 and F2 generations, and what will be the proportions of the different classes? (Draw a branch diagram to provide the answer)arrow_forwardIn snapdragons red flower colour (CR) is incompletely dominant to white flower colour (CW). The heterozygote has pink flowers. Normal broad leaves (LB) are incompletely dominant to narrow, grass-like leaves, (LN). The heterozygote has intermediate leaf width. If a red-flowered, narrow leaved snapdragon is crossed with a white-flowered broad leaved one, what will be the phenotypes in the F1 and F2 generations, and what will be the proportions of the different phenotypic classes? (You must draw a branch diagram to provide the answer for the F2)arrow_forwardgps14arrow_forward
- Consider the following hypothetical gene a plant. Gene T produces a protein that impacts stem length. There are two alleles for geneT, T which produces long stem and t which results in short stem if gene T displays incomplete dominance and what of the following genetype above would have a different phenotypearrow_forwardIn sweet peas, the given enzymatic pathway result to pigment formation in the flowers: A dihybrid plant is crossed to a white one which is heterozygous at the “C” locus (provided in the image). What is the genotype of the dihybrid plant? What is the genotype of the white plant? What kinds of flowers, colored or white, are to be expected from the cross above? Include the ratio.arrow_forwarda) You are studying cushion plants in New Zealand: the wild-type cushion plan has a wide canopy. You obtain eight cushion plants that all have narrow canopies caused by a single autosomal recessive mutation. To determine how many genes are defined by these mutations, you mate the plants together and get the results shown in the complementation table below. The “–“ represents plants with narrow canopies and the “+” represents wide canopies. What will the offspring of a cross between plants A and F look like? b) Based on the above, how many different genes are defined by the 8 mutant strains?arrow_forward
- Epistasis refers to the interaction of genes wherein the expression of one gene is dependent on another gene. For example, suppose there are two genes that code for flower color in a plant, where red, WW or Ww, is typically dominant over expression of white, ww, and yellow, YY or Yy, is typically dominant over green, yy. One type of epistasis expresses a pattern where a dominant allele in either gene produces a red phenotype. Classify the F1 flower color ratio that would be produced from the dihybrid cross for each type of epistasis.arrow_forwardUse the following information about pea plants: S = spherical seeds; s = wrinkled seeds Y = yellow seeds; y = green seeds P = purple flowers; p = white flowers I = inflated pods; i = constricted pods Write the phenotype produced by the following genotypes: PP Pp SS ss SSPp IiPp IIPParrow_forwardThe ABCDE Model of flower development dictates the combination of transcription factors require to initiate each whorl of a flower. Based on the diagram below, what would happen if: Carpels and ovules Sepal Petal Stamen 2 4 Whorl A Genes E 25-40 The ABCDE model of floral organ determination in Arabidopsis In addition to the A-, B-, and C-function genes of the ABC model, this model includes two additional gene classes, D and E. In the ABCDE model, class A + E genes specify sepals; class A + B + E, petals; class B +C +E, stamens; class C + E, carpels; and class C+ D + E, ovules. 1. Gene D was non-functional: 2. Gene E was non-functional: 3. Only Gene A was functional: 4. Gene B and E were non-functional: 5. Only Gene A and Gene E were functional: Hint: If Gene A was non-functional the flower would have no sepals or petals, it would be composed of only stamens and carpels.arrow_forward
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