Reproduction
What is the most important goal of an organism?
Reproduction
What is the production of offspring whose genes all come from one parent without the fusion of egg and sperm.
asexual reproduction
Sponges are a unique animal that live in water. If a piece of a sponge broke off and then grew into its own sponge, would it be asexual or sexual reproduction?
What is this called?
Asexual
Budding
What is the production of offspring by the fusion of haploid gametes (eggs & sperm) from two parents to form a diploid zygote (fertilized egg).
sexual reproduction
Explain how reproduction leads to natural selection.
The passing of beneficial traits is essential for NS.
diploid cells are produced during _________
mitosis
Why would animals reproduce asexually?
A variety of answers could be used.
How many cells are produced in Meiosis and how many chromosomes does each have ?
4 gametes each with 1/2 the normal number of chromosomes
What are the two main types of reproduction?
Bacteria and many protozoa can reproduce this way – one cell separating into two or more individuals approximately the same size.
How are the new bacteria and protozoa compared to each other?
They are identical.
What cellular process do anoles (lizards) use to regenerate their tails?
Mitosis.
True or False: Sexual reproduction creates genetic variability and it is increased by the random combinations of genes from the parents.
True
Which type of reproduction leads to more genetic variability?
Sexual Reproduction because you are giving the offspring their own unique DNA.
How do you know if reproduction is asexual ?
There is only 1 parent
Name One Advantage of asexual reproduction?
Animals living far from members of their own species can reproduce without having to search for a mate.
Numerous offspring quickly – ideal for colonizing a new area.
Advantageous in a stable, favorable environment because it reproduces a successful genotype precisely.
What are the disadvantages or cost of sexual reproduction versus asexual reproduction
More complicated, finding a mate.
Requires more time.
Uses more energy.
The cost of meiosis to the female is passage of only half of her genes to offspring.
Production of males reduces resources for females that could produce eggs.
Slower population growth
Reproduction is the production of ________
offspring
What is a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.
mitosis
Name one disadvantage of asexual reproduction?
Identical offspring respond in the same way to the environment, therefore if there is an environmental change they face extinction.
Same diseases can be transferred to the next generation.
No variation within species, will not allow for evolution with changing enviornment.
Gametes arise by meiosis because?
Because meiosis creates cells that are destined to become gametes (or reproductive cells), this reduction in chromosome number is critical (23 and 23 for human chromosomes) — without it, the union of two gametes during fertilization would result in offspring with twice the normal number of chromosomes!