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2019 Science Exam

Semester 2 (2019) Exam Revision

QuestionAnswer
chromosomes thread-like structures in the nucleus;
Number of chromosomes in a body cell 46
Number of Chromosomes in a gamete 23 chromosomes in sperm or egg
Know the structure of DNA alternating sugar and phosphate units
mitosis Mitosis-daughter cell identical to parent cell
meiosis meiosis-daughter cell has half of number in parent cell
gamete formation Gametes formation can be observed in gonads
when the sex of an individual is determined when the egg is fertilised by the sperm
where chromosomes are found in the nucleus of most cells of your body
phenotype the observable expression of these genes from a genotype
genotype The genetic make up
Know what an allele is alternative forms of a gene found at the same locus on a chromosome.
homozygous having two alleles the same on homologous chromosomes
heterozygous having two different alleles on homologous chromosomes
Chromosomes in Female Animals In most animals, the female has two X chromosomes
Chromosomes in Male Animals 1 X and 1 Y Chromosome
X and Y Chromosomes use in a human Sex Determination
Know what DNA deoxyribonucleic acid
what ‘bases’ you find within DNA adenine, cytosine, thymine and guanine
rDNA technology Technology whereby the DNA of one organism is recombined with genes from another organism.
stem cells Cells in an embryo are initially identical.
the process of differentiation As the embryo matures, cells take on specific characteristics and become different from each other
Created by: Jalfo03