Y9 Genetics And Inheritance Flashcards
What does the cell surface membrane do?
Controls what enters and leaves the cell
What does the nucleus contain?
DNA (chromosomes)
What is a chromosome?
A strand / piece of DNA
What is the cytoplasm?
Where chemical reactions take place
What is the mitochondria?
The site of respiration
What is variation?
The difference between individuals of the same species
What are the types of variation?
Genetic (inherited) and environmental variation
What is DNA an abreviation of?
Deoxyribonucleaic Acid
How many chromosomes do human body cells have?
46 (23 pairs)
How many chromosomes do human sex cells have?
23
How many chromosomes do human sex cells have?
23
What is a gene?
Coding regions of each chromosome which determine different characteristics
What is an allele
Different forms of a gene that are possible
What are homozygous alleles?
Alleles that are the same
What are heterozygous alleles?
Alleles that are different
What is a genotype?
The alleles of an individual
What is a phenotype?
The physical appearance of a person
Name 5 dominant characteristics?
Dark hair, wavy hair, brown eyes, free earlobes, freckles
What is the shape of DNA
double helix
