outside of body, must occur in water
what happens in external fertilization?
produce thousands of eggs and sperm
what happens outside of the body?
animals gather in large groups
what happens when it must occur in water?
inside body, sperm releases in female body
what happens in internal fertilization?
may occur on land
what happens inside the body?
does meiosis occur in asexual or sexual?
are eggs and sperm produced in asexual or sexual?
does mitosis occur in asexual or sexual?
are the offspring clones in asexual or sexual?
does mating occur in asexual or sexual?
asexual reproduction in which a part of the parent organism pinches off and forms a new organism
examples of budding
reproduction in which the parent separates into 2 or more pieces, each forms new organism
how many chromosomes in each human sex cell?
how many pairs of chromosomes in each human sex cell?
haploid sperm cell fertilizes haploid egg cell to produce diploid fertilized or zygote egg
in terms of haploid and diploid, explain how egg is fertilized.
homologous chromosomes condense, the nuclear envelope dissolves, and spindle fibers form.
homologous chromosomes are lined up at center of cell
homologous chromosomes are pulled apart and moved to opposite end of cell
cytokinesis occurs, and 2 haploid daughter cells are formed
chromosomes of the 2 haploid cells become attached to spindle fibers
chromosomes line up in center of each of 2 new haploid cells
attachment between sister chromatids break, each sister chromatid is now considered a daughter chromosomes.
each haploid cell completes division, producing a total of 4 haploid daughter cells
no sex cells (gametes) are involved, no sex organs (ovaries, testes) involved, mitosis occurs to produce new cells, no sperm or egg means certain body cells must undergo mitosis to form offspring, offspring are identical to one another and parent; clones. asexual or sexual?
sex cells, sperm and egg are necessary, organs used to form sex cells (ovaries-eggs, testes-sperm),meiosis occurs to form sex cells, mating (male and female joining to make sure egg and sperm meet; as a result fertilization is more likely, offspring very from each other and parents; some features of each parent in offspring. sexual or asexual?
generally for animals that live in water or deposit eggs in water; sperm must be able to swim to egg, parents provide little or no care, lack of care demands thousands or sperm, egg cells, ex: fish, starfish, frogs, sponges. external or internal?
occur in animals living on land and out of water, internal release of sperm increases the chance the egg will become fertilized, parents provide care/protection to fertilized egg and young. internal or external?
certain time of year when particular kinds of organism reproduce; water, temperature important factors
a cycle in which a female will mate at only certain time
2 cellular divisions resulting in 4 sex cells, each with half number of chromosomes of original cell
what does meiosis involve?
4 sperm cells
in human males, what results from meiosis?
only 1 egg cell survives out of the possible 4 (others, called polar bodies, die)
in human females, what results from meiosis?
a fertilized egg
four new cells are formed from each original.meiosis or mitosis?
this process makes sperm cells. meiosis or mitosis?
two new cells are formed from each original.meiosis or mitosis?
new skin cells are made this way. meiosis or mitosis?
this type of cell reproduction helps you grow.meiosis or mitosis?
this type of cell reproduction makes egg cells.meiosis or mitosis?
this makes cells with half the number the original cell chromosomes number.meiosis or mitosis?
this makes cells with the same chromosome number as the original.meiosis or mitosis?
stage when person produces sex cells
organs that produce eggs
small cell formed and then dies during meiosis in female
organs that produce sperm
egg and sperm
cell that make up the skin, blood, bones, and stomach
the 2 strands of a doubled chromosome
one-half as many chromosomes as their parents
offspring that result from meiosis and fertilization each have...
mitosis to produce a larger population
the least genetic variation will probably be found in the offspring of organisms that reproduce using...
genetic variability of offspring
meiosis and fertilization are important for the survival of many species because these 2 processes result in...
meiosis is a process that results in the formation of cells that have a haploid number of chromosomes.true or false?
the daughter cells produced by the process of meiosis have the same number of chromosomes as their so-called parent cells.true or false?
in meiosis cell division occurs twice resulting in the formation of 4 cells.true or false?
the genetic information in the daughter cells produced by meiosis is that the same as the genetic information in the parent cell.true or false?
sperm and egg cells are collectively referred to as gametes.true or false?
fertilization is the union of a sperm cell and egg cell.true or false?
when an egg cell and a sperm cell unite, the resulting cell is diploid with respect to the chromosome number.true or false?
fertilization of an egg cell must occur externally for all aquatic organisms.true or false?
the production of gametes occurs in specialized structures called gonads.true or false?
most animal species produce more eggs than sperm cells.true or false?