haplodiplontic life cycle
Which multicellular stage in the plant life cycle is diploid quizlet?
When undergoing sexual reproduction, there are two multicellular phases in the life cycle – a diploid phase called
the sporophyte
(spore-producing plant) and a haploid phase called the gametophyte (gamete-producing plant).
What is the diploid multicellular stage?
In the diploid-dominant life cycle, the multicellular diploid stage is
the most obvious life stage, as occurs with most animals, including humans
. Nearly all animals employ a diploid-dominant life cycle strategy in which the only haploid cells produced by the organism are the gametes.
Is the diploid multicellular stage in the life cycle of a plant or alga?
A sporophyte
(/ˈspɔːr. əˌfaɪt/) is the diploid multicellular stage in the life cycle of a plant or alga. It develops from the zygote produced when a haploid egg cell is fertilized by a haploid sperm and each sporophyte cell therefore has a double set of chromosomes, one set from each parent.
Are plants diploid or haploid?
Unlike animals(see Chapter 2), plants have
multicellular haploid and multicellular diploid
stages in their life cycle. Gametes develop in the multicellular haploid gametophyte (from the Greek phyton, “plant”). Fertilization gives rise to a multicellular diploid sporophyte, which produces haploid spores via meiosis.
What is the gametophyte stage?
The gametophyte is
the sexual phase in the life cycle of plants and algae
. It develops sex organs that produce gametes, haploid sex cells that participate in fertilization to form a diploid zygote which has a double set of chromosomes.
Which parts of the life cycle are diploid quizlet?
The two stages are called the sporophyte generation and the gametophyte generation. The
sporophyte generation
is diploid (has pairs of chromosomes).
Are plant zygotes haploid or diploid?
The zygote develops into a mature multicellular diploid individual (the sporophyte), which produces
haploid spores
via meiosis. The haploid spores then develop into a mature multicellular haploid individual.
Are gametophytes haploid or diploid?
In terms of chromosomes, the gametophyte is
haploid
(has a single set of chromosomes), and the sporophyte is diploid (has a double set).
Do fungi have a multicellular diploid stage?
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. In alternation of generations,
both the haploid and the diploid stages are multicellular
, though they may be dominant to different degrees in different species.
What kind of life cycle include multicellular haploid stage?
In regard to changes of ploidy, there are 3 types of cycles:
haplontic life cycle
— the haploid stage is multicellular and the diploid stage is a single cell, meiosis is “zygotic”. diplontic life cycle — the diploid stage is multicellular and haploid gametes are formed, meiosis is “gametic”.
Which type of life cycle has both a haploid and a diploid multicellular stage?
The zygote immediately undergoes meiosis to form four haploid cells called spores (Figure 7.2 b). The third life-cycle type, employed by some algae and all plants, is called
alternation of generations
. These species have both haploid and diploid multicellular organisms as part of their life cycle.
What is haploid and diploid?
Haploid is the quality of a cell or organism having a single set of chromosomes
. Organisms that reproduce asexually are haploid. Sexually reproducing organisms are diploid (having two sets of chromosomes, one from each parent). In humans, only their egg and sperm cells are haploid.
Which generation of a plant is diploid?
The sexual phase, called the gametophyte generation, produces gametes, or sex cells, and the asexual phase, or sporophyte generation, produces spores asexually. In terms of chromosomes, the gametophyte is haploid (has a single set of chromosomes), and
the sporophyte
is diploid (has a double set).
What are the 5 stages of plant life cycle?
There are the 5 stages of plant life cycle. The
seed, germination, growth, reproduction, pollination, and seed spreading
stages.
How do plants alternate between diploid and haploid?
Plants alternate between diploid-cell plants and haploid-cell plants. This is called
alternation of generations
, because the plant type alternates from generation to generation. In alternation of generations, the plant alternates between a sporophyte that has diploid cells and a gametophyte that has haploid cells.
In which of the following plant diploid stage generally dominates?
Although in case of bryophytes (mosses and liverworts) the dominant generation is haploid, the diploid generation is dominant in the
tracheophytes (vascular plants)
, and the sporophyte makes up the principal plant.
Is female gametophyte haploid or diploid?
The central cell of the female gametophyte in these taxa contains only one haploid nucleus
; thus endosperm is diploid and has a ratio of one maternal to one paternal genome. Based on comparisons among flowering plants, we conclude that the angiosperm female gametophyte is constructed of modular developmental subunits.
What is the gametophyte of a flowering plant?
In flowering plants,
the pollen grain
is the male gametophyte and the embryo sac is the female gametoph yte. The male gametophyte completes its early development within the anther.
In what stage does the plant produce spores?
In the
sporophyte phase
a diploid (having two sets of chromosomes) plant body grows and eventually produces spores through meiosis.
How do the sporophyte stage and the gametophyte stage make a cycle?
Fusion of the male and females gametes forms the diploid zygote, which develops into the sporophyte. After reaching maturity, the diploid sporophyte produces spores by meiosis, which in turn divide by mitosis to produce the haploid gametophyte. The new gametophyte produces gametes, and the cycle continues.
During which stage does a plant reproduce asexually?
During the
vegetative period
of their life cycle (which may be as long as 120 years in some bamboo species), these plants may reproduce asexually, accumulating a great deal of food material that will be required during their once-in-a-lifetime flowering and setting of seed after fertilization.
What are diploid plants?
In sporophyte. In the sporophyte phase a diploid (
having two sets of chromosomes
) plant body grows and eventually produces spores through meiosis. These spores divide mitotically to produce haploid (having a single set of chromosomes) gamete-producing bodies called gametophytes.
Are adults diploid?
Organisms with a diploid life cycle spend the majority of their lives as diploid adults
. When they are ready to reproduce, they undergo meiosis and produce haploid gametes. Gametes then unite in fertilization and form a diploid zygote, which immediately enters G
1
of the cell cycle.
Are fungi diploid or haploid?
In the majority of fungi,
all structures are haploid except the zygote
. Nuclear fusion takes place at the time of zygote formation, and meiosis follows immediately. Only in Allomyces and a few related genera and in some yeasts is alternation of a haploid thallus with a diploid thallus definitely known.
