1. DNA replication occurs during mitosis and meiosis. The original DNA strand disappears during replication. 2. The genetic code is made up of base triplets. The allele that always appears in phenotypes is called the dominant allele. The recessive allele is always written in small letters. 3. James Watson and Francis Crick gave the double helix model of DNA. DNA stands for deoxyribonucleic acid. There are 4 bases that make up DNA. The cell nucleus controls cell functions. Genotype is the genetic makeup and phenotype is the observable characteristics.

1. Genetics1

2. 2DNA replication occurs at mitosis or Meiosis?In replication , the original strand disappears- true / falseGenetic code is made up of – chromosomes or base tripletsThe allele for a character that always appears in phenotypes is called- dominant / recessive5. The recessive allele is always written in capital / small letters

3. 311 Sci write the answers only to the following questionsName the scientist who gave the double helix model of DNADNA stands for _____________________________ acidHow many bases make the DNA?Who controls the functions of the cell?What is genotype?What is phenotype?

4. 4Write the answers to the questions below onlyWho is called the father of genetics?A person with black hair has genes Bb. What is his genotype and phenotype.What is monohybrid cross?The characters which will be in the baby are decided at meiosis or fertilisation?Two alternate forms of genes is called chromosome or allels?There are 23 pairs of chromosomes in zygote or a gamete?

5. 5Which cell division is for growth?Which cell division is for reproduction?What are the same looking chromosomes called?What is a gamete and how many chromosomes does this contain?What is zygote how many chromosomes does this contain?Which cell division involves replication?

6. Genetics terms you should know6Genetics TraitVariation and its types genotypeAsexual and Sexual reproduction phenotypeGametes replicationZygote alleleFertilisation Dominant , recessiveEmbryo allelesMitosis monohybrid crossMeiosis Pedigree chartCloning punnet squareChromosome homozygousHomologous chromosomes heterozygousDNA cloningDouble helix structure selective breedingGenetic code pollination

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8. Genetics:Branch of science that studies how genes are inherited and expressed in plants ,animals and human beings8

9. VariationThe genetic variations observed in a species and population.Two types:9

10. 1)Acquired VariationsThe variations due to environmental Factors or personal actions .e.g. Hair dyeing, long nails, cosmetic surgery10

11. 2) Inherited Variation:The differences that are determined by what we received from our parents at the time of conception.Two types:11

12. 1) Continuous Variation When a difference shows range in population .e.g. Hair colour can be black, brown, light brown and blonde. 2) Discrete Variation: When a difference shows a simple or discrete occurance.e.g. Ear lobes are fused or not fused. Rolling or not rolling tongue.12