BIOLOGY-TEXT
5th Edition
ISBN: 9781260169621
Author: BROOKER
Publisher: MCG
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Textbook Question
Chapter 20, Problem 8TY
Which of the following genes do not play a role in the process whereby segments are formed in the fruit fly embryo?
- a. MyoD
- b. gap genes
- c. pair-rule genes
- d. segment-polarity genes
- e. All of the above play a role in segmentation.
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Students have asked these similar questions
If you observed fruit flies with the following developmental abnormalities, would you guess that a mutation has occurred in a segmentation gene or a homeotic gene? Explain your guess.
A. Three abdominal segments were missing.
B. One abdominal segment had legs.
C. A fly with the correct number of segments had two additional thoracic segments and two fewer abdominal segments.
Bicoid is normally found at one end of a fly egg. A defective form of bicoid results in an embryo with two tail ends. If the normal form of bicoid was placed at both ends of an egg what would be the result?
Group of answer choices
A. a normal larva
B. a fly with body parts in the wrong regions
C. an embryo with two tail ends
D. an egg with no cell division
E. an embryo with two head ends
A. An embryo sac (ovule) contains eight haploid nuclei.B. Three nuclei become three synergids, 2 polar nuclei, 3 antipodal nuclei.
A.If statement A is wrong and B is correct.
B.If both statements are wrong.
C.If both statements are correct.
D.If statement A is correct and B is wrong.
Chapter 20 Solutions
BIOLOGY-TEXT
Ch. 20.1 - 20.1 General Themes in Development Concept Check:...Ch. 20.1 - Prob. 2CCCh. 20.1 - Prob. 1CSCh. 20.2 - Development in Animals I: Pattern Formation...Ch. 20.2 - Development in Animals I: Pattern Formation...Ch. 20.2 - Prob. 3CCCh. 20.2 - Core Skill: Modeling The goal of this modeling...Ch. 20.2 - Development in Animals I: Pattern Formation Core...Ch. 20.3 - Development in Animals II: Cell Differentiation...Ch. 20.3 - Development in Animals II: Cell Differentiation...
Ch. 20.3 - Development in Animals II: Cell Differentiation...Ch. 20.3 - Development in Animals II: Cell Differentiation...Ch. 20.3 - Development in Animals II: Cell Differentiation...Ch. 20.4 - Development in Plants Concept Check: Where are...Ch. 20.4 - Prob. 2CCCh. 20 - The process whereby a cells morphology and...Ch. 20 - Prob. 2TYCh. 20 - Positional information is important in determining...Ch. 20 - Morphogens are a. molecules that disrupt normal...Ch. 20 - Prob. 5TYCh. 20 - Arrange the following phases of pattern formation...Ch. 20 - Prob. 7TYCh. 20 - Which of the following genes do not play a role in...Ch. 20 - An embryonic stem cell that can give rise to any...Ch. 20 - Prob. 10TYCh. 20 - Prob. 1CQCh. 20 - The MyoD gene in mammals plays a role in muscle...Ch. 20 - Prob. 3CQCh. 20 - Prob. 1COQCh. 20 - Is it possible for a phenotypically normal female...
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- Which of the following are types of segmentation genes? a. Gap genes b. Pair-rule genes c. Segment-polarity genes d. All of the above are types of segmentation genes.arrow_forwardWhich of the following is the sequence in which the segmentation genes act? a. Segment-polarity genes → gap genes → pair-rule genes b. Gap genes → pair-rule genes → segment-polarity genes c. Segment-polarity genes → pair-rule genes → gap genes d. Gap genes → segment-polarity genes → pair-rule genesarrow_forwardPropose a hypothesis that could explain the following observation. A graduate student performing studies on mutations in drosophila (fruit flies) discovered a strain of flies with a silent mutation in the gene controlling the shape of the wings. Further investigation has shown that this mutation is lethal in flies who are homozygote. Flies that are homozygote wild type or heterozygote can develop and are able to survive.arrow_forward
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- What structure is most important in forming the tetrads? a. centromere b. synaptonemal complex c. chiasma d. kinetochorearrow_forwardWhich of the following statements is TRUE? a. In mammals and chickens, the first cells to ingress through the primitive groove replace the hypoblast. b. In mammals and chickens, the first cells to ingress through the primitive groove become the hypoblast. c. In chickens the first cells through the primitive streak replace hypoblas, but in mammals the first cells to ingress through the primitive groove become the hypoblast. d. In mammals the first cells to ingress through the primitive groove replace the hypoblast, while in chickens the first cells to ingress become mesoderm.arrow_forwardHox genes encode transcription factors that a. control segmentation. b. promote determination. c. cause cell differentiation. d. do all of the above.arrow_forward
- The following are various developmental phenomena relating to the concepts and principles in developmental biology. Choose the correct answer from the list. A. Concept of apoptosis B. Concept of prefomed guidelines C. Concept of programmed gene action D. Concept of capacity E. Concept of fate F. Concept of environmental influences G. Concept of induction H. Concept of progressively formed guidelines I. Concept of Differentiation J. Concept of guidelines K. Concept of Gradient L. Concept of differentiation Question #1. Neuralizing factors are concentrated at the anterior part of the organism. What concept? Question #2. There are development control genes that specify the antero-posterior axis of the body. What concept? Question #3. The guidelines are contained in the original zygote. What concept?arrow_forwardThe following are various developmental phenomena relating to the concepts and principles in developmental biology. Choose the correct answer from the list. A. Concept of apoptosis B. Concept of prefomed guidelines C. Concept of programmed gene action D. Concept of capacity E. Concept of fate F. Concept of environmental influences G. Concept of induction H. Concept of progressively formed guidelines I. Concept of Differentiation J. Concept of guidelines K. Concept of Gradient L. Concept of differentiation Question #1. The outermost part of the cup-shaped embryo is destined to form the nervous system and the skin. What concept? Question #2. It refers to the directive influences in ontogeny. What concept? Question #3. Sculpturing of the fingers. What concept?arrow_forwardUsually, the mutant alleles studied in Drosophila experiments are recessive because: A. they are difficult to create. B. they are loss of function mutations. C. they do not survive as long as dominant alleles. D. they do not occur in wild-type flies.arrow_forward
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