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Chapter 11: Q.29 (page 295)

How do organisms with haploid-dominant life cycles ensure continued genetic diversification in offspring without using a meiotic process to make gametes?

Short Answer

Expert verified

Organisms with haploid-dominant life cycles ensure continued genetic diversification in offspring by making a diploid zygote Haploid-dominant organisms undergo sexual reproduction.

Step by step solution

01

Step1.Introduction 

In a haploid-dominant life cycle, the multicellular (or sometimes unicellular) haploid stage is the most obvious life stage and is often multicellular.

In this type of life cycle, the single-celled zygote is the only diploid cell. Fungi and some algae have this type of life cycle.

02

Step2. Explanation  

  • Haploid-dominant organisms undergo sexual reproduction by making a diploid zygote.
  • The cells that make the gametes are derived from haploid cells, but the + and 鈥� mating types that produce the zygote are randomly combined.
  • The zygote also undergoes meiosis to return to the haploid stage, so multiple steps add genetic diversity to haploid-dominant organisms.

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Most popular questions from this chapter

Explain why sexual reproduction is beneficial to a population but can be detrimental to an individual offspring.

Explain how the random alignment of homologous chromosomes during metaphase I contribute to the variation in gametes produced by meiosis.

Meiosis usually produces ________ daughter cells.

a. two haploid

b. two diploid

c. four haploid

d. four diploid

What structure is most important in forming the tetrads?

a. centromere

b. synaptonemal complex

c. chiasma

d. kinetochore

Which statement best describes the genetic content of the two daughter cells in prophase II of meiosis?

a. haploid with one copy of each gene

b. haploid with two copies of each gene

c. diploid with two copies of each gene

d. diploid with four copies of each gene
See all solutions

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