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Plants and Humans
Module 3 & 4
43
Biology
Undergraduate 1
04/08/2013

Additional Biology Flashcards

 


 

Cards

Term
Define fertilization?
Definition
Fertilization occurs in flowering plants when the male pollen or gametophyte, assisted by various agents, pollinates the ovum, a process that can occur within one flower or between the flowers of the same or different plants

Term
Define Pollination?
Definition
 is the process by which pollen from a plant's anther is transferred to another plant's stigma. This transferral fertilises the plant and the plant then goes on to reproduce (for example, produce seeds).
Term
Describe double fertilization?
Definition

- refers to when flowering plants contain two sperm cells that each fertilize a different cell.

-involves the fusion of two sperm cell nuclei of the male gametophyte with two cell nuclei of female gametophyte. One sperm fuses with the haploid egg cell to form the zygote; the other sperm unites with the diploid central cell to form a triploid cell that will develop to an endosperm.

Term
Whatis endosperm?
Definition

-is the tissue produced inside the seeds of most flowering plants around the time of fertilization. It surrounds the embryo and provides nutrition in the form ofstarch, though it can also contain oils and protein. This can make endosperm a source of nutrition in human diet.

-tissue that surrounds and nourishes the embryo in the angiosperm seed. The initiation of endosperm is a definitive characteristic of angiosperms and requires the fusion of at least one nucleus in the embryo sac with a sperm nucleus from the pollen grain. 

Term
Describe the differenttypes of pollination
Definition

CROSS POLLINATION  is the transfer of pollen grains from the anther of a flower to the stigma of a flower of a different plant of the same species.

& SELF POLLINATION s the transfer of pollen grains from the anther to the stigma of the same flower or of another flower of the same plant.

 

Term
What is a fruit and what is its function
Definition

-The primary function is to a plant is to scatter seeds.


- is a part of a flowering plant that derives from specific tissues of the flower, one or more ovaries, and in some cases accessory tissues.

Term
Define the parts ofthe fruit: endocarp
Definition

The innermost layer of the pericarp that surrounds a seed in a fruit.


-the hard inner layer of the pericarp of many fruits, such as the pit or stone of a cherry, peach, or olive.

Term
define mesocarp?
Definition

The middle layer of the pericarp of a fruit, between the endocarp and the exocarp.

 

-The middle, usually fleshy layer of a fruit wall.

Term
define exocarp?
Definition

The outer layer of the pericarp of a fruit.

-outermost layer of the pericarp of fruits: forms the skin 

Term
Know specific differences between Mitosis and Meiosis....
Definition

Mitosis: type of nuclear division resulting in 2 genetically identical daughter cells: Division used in growth

 

Meiosis: specialized type of nuclear division which results in 4 genetically different daughter cells that have 1/2 the # of chromosomes as the mother cell

Term
What is Mitosis?
Definition
type of nuclear division resulting in 2 genetically identical daughter cells: Division used in growth
Term
What is Meiosis?
Definition
specialized type of nuclear division which results in 4 genetically different daughter cells that have 1/2 the # of chromosomes as the mother cell
Term
Know each stage of Mitosis including what happens in Interphase:
Definition

I-P-M-A-T

 

Iterphase

Prophase

Metaphase

Anaphase

Telophase

Cytokinesis

Term

Know each stage of Mitosis including what happens in...

phase: interphase

Definition
cell spends majority of the time in this stage synthesizes molecules, DNA replication
Term
Know each stage of Mitosisincluding what happensin phase: prophase
Definition
chromosomes condensed and become visible nuclear membrane disappears
Term
Know each stage of Mitosisincluding what happensin phase metaphase:
Definition
chromosomes align in the equational plane of the cell. spindle fibers appear
Term
Centromere?
Definition

The point on a chromosome by which it is attached to a spindle fiber during cell division.


-sticky part of chromosomes

Term
Know each stage of Mitosis including what happens in phase Anaphase:
Definition
chromosomes seperate and pull apart to opposite end of poles b spindle fibers
Term
Know each stage of Mitosis including what happens in phase Telophase:
Definition
chromosomes organise themselves and the nuclear envelope develops
Term
Know each stage of Mitosis including what happens in phase cytokinesis:
Definition
division of the sytopeasm resulting in 2 genetically identical daughter cells
Term
Define chromatin:
Definition
long thin strands of DNA complesed w/ protein
Term
where does crossing over occur? Meiosis
Definition
metaphase- induces genetic vataibility
Term
In anaphase in Meiosis chromosomes>>>
Definition
go to opposite ends of pole
Term
diploid:
Definition
# of chromosomes per body cells
Term
Meiosis: 2 nuclear divisions: Meiosis 1  meiosis 2
Definition
end up with 4 genetically different daughter cells 1/2 of chromosomes
Term
stages of Meiosis 2 is like
Definition
a mitotic division
Term
stages of meiosis 2 : cytokinesis
Definition
end with 4 genetically different daughter cells
Term
Define allele and know the types...
Definition

alternae forms of genes

 

Dominate & Recessive

Term
Alleles: Dominate...
Definition
trait thats always expressed
Term
alleles: recessive
Definition
trait suppressed by dominate alleles
Term

Know difference between homozygous and heterozygous genes...

 

homozygous...

Definition
alleles are the same
Term

Know difference between homozygous and heterozygous genes

 

heterozygous...

Definition
alleles are different
Term
gene:
Definition
organized unit of DNA
Term

what occur in pairs in diploid organisms

one set given by each parents

Definition
gene
Term
what determines hereditary characteristics of an organisms
Definition
gene
Term
what occur in linear sequence on chromosomes
Definition
genes
Term
what puts DNA sequence together
Definition
ribosomes
Term
phenotypes are ...
Definition
physical characteristics
Term
when can you see a recessive trait?
Definition
only in hommozygous form
Term
biological engineering...
Definition
it is the only type of engineering applied tto living
Term
PP
Definition
homozygous dominent
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