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Bioligy b1.1

bioligy

QuestionAnswer
what are the three main parts of most cells? cytoplasm cell membrane nucleus
name the substance with long strands inside the nucleus? DNA
what does each strand form ? chromosome
how many copies are there of each chromosome? 2
what are chromosomes divides up into? genes
what do genes do ? control variation in out characteristics?
Variation caused by genes is called? inherited variation
what is the name given to same genes with different forms? alleles
how many pairs of chromosomes are there in human body cell nuclei 23 pairs
how many genes are there in 23 pairs of chromosomes 23000
what do animals and plants produce gametes (sex cells)
state the name of the male gametes in animals? sperm cells
state the name of the male gametes in a plant pollen grains
what is the female gametes in plants and animals? egg cells
how many alleles do gametes have for each gene? 1
what happens in a sexual reproduction? two gametes fuse together
some alleles are dominant
some alleles are recessive
what is a dominant allele shown as? capitals letter
what is the recessive cell shown as lower case of the same letter
what are the alleles in a organism genotype
what organisms look like is called phenotype
if what both alleles for a gene in an organism are the same what is it calles homozygous
if the alleles for a gene in a an organisms are different what is it called? heterozygous
Created by: chantelcole
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