Reproduction Flashcards
Give the two types of cell division
Mitosis
Meiosis
What does meiosis produce?
Haploid non-identical sex cells (gametes-sperm and egg cells) animal cells
Pollen and egg cells in plants
What do gametes fuse to form during fertilisation?
Diploid fertilised egg cell
What is a nucleotide made of?
Sugar and a phosphate group - with one of four bases, A,C,T or G
Give the base pairs
A and T
G and C
What’s a double helix held together by?
Weak hydrogen bonding between the complimentary base pairs
What’re chromosomes made up of?
Genes
What is the genome?
One copy of all an organisms DNA
What’s the human genome projects aims?
-To work out the order or sequence of all the three billion base pairs in the human genome
-identify all genes
-to develop faster methods for sequencing DNA
What’re scientists making more effective due to the human genome project?
More effective I’ve medicines
Give the aim for the practical extracting DNA from fruit
To extract dna from a fruit
What does meiosis promote?
Genetic variation among individuals of the same species
What’re alleles?
Different formes of genes
