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Chapter 11: Problem 10

What is a source of variation in asexual reproduction? a. crossing over of chromosomes b. mutation of DNA c. random assortment of chromosomes d. There is no variation in asexual reproduction.

Short Answer

Expert verified
b. mutation of DNA

Step by step solution

01

- Identify the Definition

Asexual reproduction is a type of reproduction where offspring are produced from a single parent, without the involvement of gametes (sperm and egg).
02

- Analyze the Options

Examine the given options to see which one involves genetic variation in the context of asexual reproduction.
03

- Evaluate Each Option

Option a (crossing over of chromosomes) and option c (random assortment of chromosomes) are processes that occur during sexual reproduction, not asexual reproduction. Option d states that there is no variation in asexual reproduction, which is incorrect.
04

- Determine the Correct Answer

Mutations are changes in the DNA sequence that can occur randomly and are the primary source of genetic variation in asexual reproduction. Thus, option b is correct.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

mutation in DNA
Mutations are changes that happen in the DNA sequence of a cell. Imagine your DNA as a cookbook filled with recipes鈥攖he instructions to make you. Sometimes, small typos (mutations) can occur during the copying of these recipes. These typos can have various effects. They can be:
  • Beneficial: Offering new traits that may be advantageous
  • Neutral: Having no noticeable effect
  • Harmful: Causing a disadvantage or disease
In the context of asexual reproduction, mutations are vital. Why? Because the DNA in the offspring is usually identical to the parent's DNA. However, these occasional mutations introduce new, potentially beneficial variations. This variability could help the organism adapt to changing environments over time.
genetic variation
Genetic variation refers to the differences in DNA sequences among individuals. In sexually reproducing organisms, this variation comes from the mixing of genes from two parents. But what about asexual reproduction?
  • Asexual reproduction gives rise to offspring that are typically genetic clones of the parent.
  • This means that any genetic diversity must come from mutations in the DNA.
  • Without mutation, all offspring would be exactly the same, presenting a risk if the environment changes.
Therefore, even in asexual reproduction, genetic variation through mutation is critical for the survival and evolution of species.
asexual reproduction
Asexual reproduction is a method where a single organism produces offspring without the need for a mate. Think of it like a plant cloning itself. Some key points include:
  • It is quick and efficient, allowing for rapid population growth.
  • No need for specialized reproductive organs or complex mating behaviors.
  • Common in bacteria, plants, and some invertebrate animals like starfish.
Because it involves only one parent, the offspring are usually genetic clones.
However, as mentioned earlier, mutations in DNA can introduce variations. This efficient method, combined with occasional useful mutations, has allowed many species to thrive and adapt across diverse environments.

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Most popular questions from this chapter

What is a likely evolutionary advantage of sexual reproduction over asexual reproduction? a. Sexual reproduction involves fewer steps. b. Sexual reproduction results in variation in the offspring. c. Sexual reproduction is more metabolically efficient. d. Sexual reproduction uses up fewer resources in a given environment.

In prophase I, the homologous chromosomes are paired up and linked together. What binds the chromosomes together and maintains their alignment? a. cohesin proteins b. tetrads c. the centromere d. synaptonemal complex

Which one of the three types of life cycles of sexually reproducing organisms does not have a multicellular haploid stage? a. alternation of generations b. diploid-dominant c. haploid-dominant d. They all have a multicellular haploid stage in their life cycles.

What phase(s) of mitotic interphase is missing from meiotic interkinesis? a. \(\mathrm{G}_{0}\) phase b. \(\mathrm{G}_{1}\) phase c. \(\mathrm{G}_{2}\) phase d. \(\mathrm{S}\)-phase

Which of the following distinguishes metaphase I from metaphase II? a. Metaphase I occurs when chromosomes appear in homologous pairs on the spindle. Metaphase II has a single line of chromosomes on the spindle. A Pair of chromosomes is pulled apart and migrate towards pole in anaphase I, while in anaphase II sister chromatids separate. Telophase I reconstitutes the nucleus and loosen the chromosomes, while telophase II mimics telophase I. b. Prophase I condenses the chromosomes and eliminates the nuclear membrane. The microtubules arrange in a spindle. Prophase II mimics prophase I. Metaphase I occurs when chromosomes appear in homologous pairs on the spindle. Metaphase II has a single line of chromosomes on the spindle. Pairs of chromosomes are pulled apart and migrate towards the poles during anaphase I, while in anaphase II sister chromatids separate. Telophase I reconstitutes the nucleus and condenses the chromosomes, while telophase II mimics telophase I. c. Prophase I condense the chromosomes and add nuclear membrane. The microtubules arrange in a spindle. Prophase II mimics prophase I. Metaphase I occurs when chromosomes appear in homologous pairs on the spindle. Metaphase II has a single line of chromosomes on the spindle. Pair of chromosomes are pulled apart and migrate towards the poles in anaphase I, while in anaphase II sister chromatids separate. Telophase I reconstitutes the nucleus and loosens the chromosomes, while telophase II mimics telophase I. d. Prophase I condenses the chromosomes and eliminates the nuclear membrane. The microtubules arrange in a spindle. Prophase II mimics prophase I. Metaphase I occurs when chromosomes appear in homologous pairs on the spindle. During Metaphase II, the chromosomes line up in a double line across the spindle. Each pair of chromosomes is pulled apart and migrate towards the poles in anaphase I, while in anaphase II sister chromatids separate. Telophase I reconstitutes the nucleus and loosen the chromosomes, while telophase II mimics telophase I.
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