Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Textbook Question
Chapter 10, Problem 4CT
The photos above show flowers from Arabidopsis plants. One plant is wild-type (unmutated); the other carries a mutation in one of its ABC floral identity genes. This mutation causes sepals and petals to form instead of stamens and carpels. Refer to Figure 10.8 to decide which gene (A, B, or C) has been inactivated by the mutation.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
In roses, the synthesis of red pigment is produced by two steps in a pathway.
gene O
magenta intermediate -
gene P
colorless intermediate-
red pigment
What would the phenotype be of a plant homozygous for a null mutation of gene P?
What would the phenotype be of a plant homozygous for a null mutation of gene Q?
What would the phenotype be of a plant homozygous for null mutations of genes P and Q?
magenta
red
Match a genotype to each strain.
colorless
Strain
P locus Q locus
homozygous null mutation of gene P
homozygous null mutation of gene Q
homozygous null mutations of genes P and Q
Answer Bank
plp
PIP
What F2 ratio is expected from crossing a plant that is homozygous for a null mutation of gene P with a plant that is
homozygous for a null mutation of gene Q? Assume independent assortment.
9 colorless : 4 magenta : 3 red
9 red : 4 colorless : 3 magenta
O 9 red : 4 magenta : 3 colorless
Can you answer part a-c if its true or false
a) the AP3 and PI show auto- and cross-regulatory interactions, as well as they form obligate heterodimers to carry out the B class gene function. Therefore, if there is no PI expression, AP3 expression alone is not sufficient for establishing the petal and stamen identities.
b) Angiosperm is a group of plants whose seeds are borne within a mature ovary (fruit).
c) The organ in different organisms under every variety of forms and functions due to evolutionary development from the same or a corresponding part in a common ancestor is homologous.
You are a developmental geneticist studying flowering time variation in Arabidopsis. You perform a
mutagenesis screen to identify mutants in the photoperiod pathway. You conduct the screen and
find two different plants that show the same mutant phenotype. You then use a complementation
test. What is the predicted outcome of this test if both phenotypes are caused by mutations in
separate genes?
recover the wild type phenotype
overexpress the gene
O recover the mutant phenotype
Chapter 10 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 10 - The expression of a gene may depend on _______. a....Ch. 10 - Prob. 2SQCh. 10 - Binding of ______ to _______ in DNA can increase...Ch. 10 - Prob. 4SQCh. 10 - Prob. 5SQCh. 10 - Muscle cells differ from bone cells because...Ch. 10 - Prob. 7SQCh. 10 - Homeotic gene products _______. a. flank a...Ch. 10 - A gene that is knocked out is ________. a. deleted...Ch. 10 - Which of the following includes all of the others?...
Ch. 10 - Prob. 11SQCh. 10 - Effect of Paternal Grandmothers Food Supply on...Ch. 10 - Prob. 2DAACh. 10 - Effect of Paternal Grandmothers Food Supply on...Ch. 10 - Prob. 12SQCh. 10 - A cell with a Barr body is ___ . a. a bacterium b....Ch. 10 - Operons _____. a. only occur in bacteria b. have...Ch. 10 - Prob. 15SQCh. 10 - Why are some genes expressed and some not?Ch. 10 - Prob. 2CTCh. 10 - Almost all calico cats (one is pictured in FIGURE...Ch. 10 - The photos above show flowers from Arabidopsis...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- The photos below show flowers from two Arabidopsis plants. One plant is wild-type unmutated; the other carries a mutation in one of its ABC floral identity genes. This mutation causes sepals and petals to form instead of stamens and carpels. Refer to Figure 10.7 to decide which gene A, B, or C has been inactivated by the mutation.arrow_forwardExplain how (a) the absence of class B gene expression produces the flower structures seen in class B mutants (see Figure 22.15c) and (b) the absence of class C gene expression produces the structures seen in class C mutants (see Figure 22.15d).arrow_forwardYou are a developmental geneticist studying flowering time variation in Arabidopsis. You perform a mutagenesis screen to identify mutants in the photoperiod pathway. Given what you know about photoperiodism in Arabidopsis, what phenotype are you looking for and under what photoperiodic conditions would you perform the experiment? delayed flowering in long days delayed flowering in short days same flowering in short days early flowering in short days same flowering in long days early flowering in long daysarrow_forward
- In roses, the synthesis of red pigment is by two steps ina pathway, as follows:colorless intermediate gene Pmagenta intermediate red pigment gene Qa. What would the phenotype be of a plant homozygousfor a null mutation of gene P?b. What would the phenotype be of a plant homozygousfor a null mutation of gene Q?c. What would the phenotype be of a plant homozygousfor null mutations of genes P and Q?d. Write the genotypes of the three strains in parts a, b,and c.e. What F2 ratio is expected from crossing plants fromparts a and b? (Assume independent assortment.)arrow_forwardYeast cells are grown with galactose as the sole carbon source and ATP levels are abundant. Describe and diagram how GAL1 gene expression will be changed (or unchanged) in 1) a ΔGal3 mutant and 2) a ΔGal4 mutant in comparison to WT. (Δ is a symbol for deletion.) WT: ΔGal3: ΔGal4:arrow_forwardIn Arabidopsis, it is well-known that a pulse of full-spectrum light during the night (in an otherwise long night) will induce flowering. This suggests that plants measure the length of night, and not the length of day. If the pulse of light during the night was blue light instead of full spectrum light, what would be the flowering time response of a plant with a knockout in cry2 (relative to wild type in the same conditions)? Explain.arrow_forward
- In plants, floral organs develop from concentric rings of tissue called whorls. Beginning from the most outside ring, whorl 1 develops into sepals, whorl 2 develops into petals, whorl 3 develops into stamens, and whorl 4 develops into carpels. Analogous to the homeotic mutants of Drosophila, recessive mutations were found in genes that encode transcription factors. These mutants change the organ identity of a given whorl to the identity of a different whorl. The following table shows the mutant phenotypes caused by various floral organ mutations found in the genetic model plant, Arabidopsis. Genotype wild-type ap2 lap2 ap3 lap3 ag lag sepals carpels sepals sepals whorls 2 and 3 whorls 3 and 4 whorls 1 and 2 whorls 2 and 4 All four whorls 1 petals stamens sepals petals Based on the table above, which whorls require a functional AG gene. 2 Whorl stamens stamens carpels petals 3 carpels carpels carpels sepals 4arrow_forwardYou identify an auxotroph that doesn't grow in normal medium, but does grow in medium supplemented with Q, indicating that it has a defect in one or more enzymes in this pathway. This auxotroph is also able to grow if you supplement the medium with D. Does this data support the one gene-one enzyme hypothesis? a yes, because only one enzyme is disrupted by the mutation b yes, because only one enzyme in the pathway is functional in the mutant strain c no, because multiple enzymes in the pathway could be functional in the mutant strain d no, because multiple enzymes could be disrupted by the mutationarrow_forwardIn times of nutrient stress, the cellular slime mold Dictyostelium discoideum develops one of two cell types: pre-stalk and pre-spore. Scientists studying this development discovered that the pH of individual cells regulates the type of cell that is formed. Which of the following claims could scientists make about how environmental cues affect the gene expression of Dictyostelium discoideum? A - A response to nutrient deprivation leads to a change in pH that causes mutation in the cells, forming the different cell types. B - A response to nutrient deprivation leads to a change in pH that disrupts the cells, forcing them to develop into certain cell types. C - A response to environmental stress leads to a change in pH that triggers transcription factors to differentiate the cell type that will be formed. D - A response to environmental stress leads to a change in pH and a decrease in transcription factors that differentiate the cell type that will be formed.arrow_forward
- Would you simply answer the question for me, i saw many answers for it but still not sure. The flower color of genetically identical hemp plants (clones) is purple when the flowers develop under cold environment (30 °C). Describe in detail a molecular mechanism that could explain how these two groups of genetically identical plants differ in their gene expressions to produce different flower colors?arrow_forwardIn the module, you have learned about P-element mediated transgenesis in Drosophila and the concept of using transgenes to rescue mutant phenotypes. In the figure below, you will see a wild type fly with its natural eye colour and three mutants with their eye colours changed to vermillion, white and rosy, respectively. A schematic of P-element mediated transgenesis (as shown in the lectures) is also included in the figure. Please inspect the schematic carefully and choose which of the following statements is true: I. Injection of the white experimental transgene into the vermillion mutant embryo will not change the vermillion mutant phenotype II. Injection of the white experimental transgene in the rosy mutant embryo will change rosy eye colour to red (wild type) III. Injection of the white experimental transgene in the white mutant embryo will not change the white mutant phenotype IV. Injection of the white experimental transgene in the rosy mutant…arrow_forwardA. The genes CLV3, CLV1/2 and WUS are involved in maintaining the size of shoot apical meristem. Diagram the interactions among these gene products, using ‘—>’ for positive interactions (i.e. activation) and ‘ —|’ for negative interactions (i.e. repression). B. What phenotype would you expect for a double mutant clv3 wus? And why?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Embryology | Fertilization, Cleavage, Blastulation; Author: Ninja Nerd;https://www.youtube.com/watch?v=8-KF0rnhKTU;License: Standard YouTube License, CC-BY