CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
3rd Edition
ISBN: 9780135191811
Author: Urry
Publisher: PEARSON
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Chapter 10, Problem 10TYU
Summary Introduction
To explain:
How the triploid number accounts for Cavendish banana’s inability to form normal gametes as it is a triploid variety. Discuss how the absence of sexual reproductionmight make this species vulnerable to infection
Introduction:
Ploidy refers to the number of sets of chromosome present in a cell. Haploid refers to one set of chromosome (n), while diploid cells contain two set of chromosomes (2n). Generally, haploid cells are germ cells which are the product of reductional division (meiosis), rest of the body cells are diploid.
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Chapter 10 Solutions
CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
Ch. 10.1 - MAKE CONNECTIONS Using what you know of gene...Ch. 10.1 - How does an asexually reproducing eukaryotic...Ch. 10.1 - WHAT IF? A horticulturalist breeds orchids, trying...Ch. 10.2 - Prob. 1CCCh. 10.2 - Prob. 2CCCh. 10.2 - Prob. 3CCCh. 10.2 - WHAT IF? A certain eukaryote lives as a...Ch. 10.3 - Prob. 1CCCh. 10.3 - WHAT IF? After the synaptonemal complex...Ch. 10.4 - Prob. 1CC
Ch. 10.4 - Prob. 2CCCh. 10 - A human cell containing 22 autosomes and a Y...Ch. 10 - Homologous chromosomes move toward opposite poles...Ch. 10 - If the DNA content of a diploid cell in the G1...Ch. 10 - Prob. 4TYUCh. 10 - Prob. 5TYUCh. 10 - Prob. 6TYUCh. 10 - Prob. 7TYUCh. 10 - Prob. 8TYUCh. 10 - Prob. 9TYUCh. 10 - Prob. 10TYU
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- Suppose that you found a species S. ambivala that is closely related to S. latifolia, such that they share the same Y chromosome marker. However, S. ambivala is hermaphroditic. What would you expect to see on your gel, if you had taken twenty randomly chosen S. ambivala plants, and performed the same experiment?arrow_forwardHelparrow_forwardQ) Neurospora is used as genetic material because (A) it has short life cycle of 10 days (B) the product of single meiosis can be easily analysed (C) meiotic products are linearly arranged in the form of ordered tetrads (D) is a diploid fungusarrow_forward
- One reason that worker bees forgo their own reproduction to help their sister (the queen) reproduce is that female bees are more closely related to their sisters than they are to their own offspring. This quirk of genetics results from the fact that bees have haplodiploid sex determination, in which females are diploid, with a mother and a father, but males are haploid, developing from unfertilized eggs. Because males are haploid, they produce sperm by mitosis. Explainwhy haplodiploid sex determination causes females to be more closely related to their sisters than to their offspring.arrow_forwardWhy is meiosis necessary for sexual recombinations?arrow_forwardExplain why the following statement is false: Sexual reproduction is the only mechanism for genetic change.arrow_forward
- Experiment: Saccharomyces cerevisiae can exist stably in either a haploid or a diploid state. A haploid S. cerevisiae cell has 16 chromosomes. When certain haploids come into contact, they fuse their cell walls and membranes, followed by the fusion of their nuclear membranes. The single nucleus now has 32 chromosomes, 16 from each parent strain, and is thus a diploid. Haploid yeast strains divide mitotically to give rise to haploid progeny, and diploid strains divide mitotically to give rise to diploid progeny. Certain haploids can fuse to form diploids. Haploid S. cerevisiae exists in two "mating types," called a and a. Mating occurs only between a and a cells; no mating occurs between cells of identical mating type. We have a collection of eight a haploid mutant strains and eight a haploid mutant strains of yeast unable to synthesize tryptophan (trp). These will be combined (mated) in all possible combinations to yield diploid strains. If the diploids can grow on minimal medium,…arrow_forwardIn C. elegans there are two sexes: hermaphrodite and male. Sex is determined by the ratio of X chromosomes to haploid sets of autosomes (X/A). An X/A ratio of 1.0 produces a hermaphrodite (XX), and an X/A ratio of 0.5 results in a male (XO). In the 1970s, Jonathan Hodgkin and Sydney Brenner carried out genetic screens to identify mutations in three genes that result in either XX males (tra-1, tra-2) or XO hermaphrodites (her-1). Double-mutant strains were constructed to assess for epistatic interactions between the genes (see table). Propose a genetic model of how the her and tra genes control sex determination.arrow_forwardGametes are always haploid. Comment.arrow_forward
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