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Improving plants
lecture 19
Question | Answer |
---|---|
Chromosomes control | inheritance |
chromosomes are made of | DNA and protein |
a nucleotide is made of | a phosphate a sugar and a base |
most cells are | diploid |
different form of a gene are called | alleles |
if a species has more than two copies of a gene | it is called polyploids |
qualitative traits | are controlled by one gene...seed colour |
quantitative traits ... | are controlled by many traits...height, yield |
meiosis | reduces genetic content by half |
hybridisation means | combining different varieties of an organism |
how many generations does it take for a plant to become uniform | 6 |
hybrid vigour or heterosis refers to a plant which has | enhanced traits |
genotype | genetic makeup |
phenotype | the interaction of the genotype with the environment |
heretibility is | the proportion of phenotype controlled by genetic factors |
a gene gun is | a technique which uses microscopic gold particles to deliver genes into target cells |
genes can be transferred to a vector using a | bacteria |
GMO | genetically modified plants |
a crop with more than one new transgenic trait is called | a Stacked trait variety |
transgenic organisms are often resistant to | insects and herbicides |
Concerns of GMO foods include | health and safety, problems with new varieties spreading into maincrop and pest resistance |
traditional crops | take a long time to breed, many genes are transferred and only genes from one species can be used |
GMO crops | take a short time to breed, few genes are transferred and can use genes from any species. not allowed in organic agriculture |