Reproduction Flashcards
Define sexual reproduction
Is where a genetic information from two organisms (Mother&Father) is combined to produce offspring which are genetically different to either parent.
What do the mother and father produce in sexual reproduction?
Gametes by meiosis - Egg and sperm cells in animals
How many chromosomes in each gametes in humans contain?
23 chromosomes - half the no. of chromosomes in a normal cell
What do the egg and sperm cell do?
Fuse together by fertilisation to form a cell with the full number of chromosomes
What do offspring inherits from both parents?
Features - receives a mixture of chromosomes from its mum and dad
What does the mixture of genetic information produce?
Variation in the offspring
Give an example of an organism that can reproduce
Flowering plants
Explain how flowering plants can reproduce
They have egg cells, but their version of sperm is known as pollen
What is required in asexual reproduction?
One parent cell - so the offspring are genetically identical to the parent
What does asexual reproduction happen by?
Mitosis - an ordinary cell makes a new cell by dividing in to 2
Define the term clone
The new cell has exactly the same genetic information as the parent cell
Give examples of organism that reproduces asexually
Bacteria
Some plants
Some animals
What do gametes have?
One copy of each chromosomes
Why do gametes only have one copy of each chromosome?
When gamete fusion takes place you get the right amount of chromosomes again - two copies of each
How do you make gametes which only have half the original number of chromosomes?
Cells divide by meiosis