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Genetics Revision for Year 10 Science

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Genetics Revision for Year 10 Science
1. Blue is dominant, green is recessive. What ratio of offspring will have blue eyes from
the following cross? Heterozygous male blue-eyes, homozygous female green-eyes.
2. Write a definition for mitosis and meiosis
3. What’s the difference between a genotype and a phenotype?
4. What is the difference between a recessive allele and a dominant allele?
5. What is the difference between a heterozygous and homozygous gene?
6. What is DNA and why is it important?
7. How many chromosomes are in human cells?
8. Do nuclei in muscle cells have a different number of chromosomes to nuclei in your
bone cells?
9. What bases pair with the following sequence: A – T – G – C
10. Learn the definitions of terms: gene, chromosome, allele
11. Name the four nitrogen bases found in DNA and show which are complementary pairs.
12. A homozygous curly-haired rabbit is mated with a homozygous straight-haired rabbit.
All of the baby rabbits have straight hair.
(a) Use a capital and lower case letter to identify each allele for the gene for curly or
straight hair in rabbits.
(b) Use a Punnett square to show the cross and state the genotypes of the offspring.
(c) If one of these offspring mated with a rabbit with curly hair, use a Punnett square
to find the genotypes and phenotypes of the baby rabbits in the next generation.
13.
(a) What are antibiotics used for? Explain how they work.
(b) Write 2-3 sentences explaining the effects of overprescribing antibiotics.
14. List 4 pieces of evidence that supports evolution
15. The image below shows the separation of DNA
molecules after gel electrophoresis. Based on the
gel electrophoresis, what can be concluded?
Genetics Revision for Year 10 Science
1. Blue is dominant, green is recessive. What ratio of offspring will have blue eyes from
the following cross? Heterozygous male blue-eyes, homozygous female green-eyes.
2. Write a definition for mitosis and meiosis
3. What’s the difference between a genotype and a phenotype?
4. What is the difference between a recessive allele and a dominant allele?
5. What is the difference between a heterozygous and homozygous gene?
6. What is DNA and why is it important?
7. How many chromosomes are in human cells?
8. Do nuclei in muscle cells have a different number of chromosomes to nuclei in your
bone cells?
9. What bases pair with the following sequence: A – T – G – C
10. Learn the definitions of terms: gene, chromosome, allele
11. Name the four nitrogen bases found in DNA and show which are complementary pairs.
12. A homozygous curly-haired rabbit is mated with a homozygous straight-haired rabbit.
All of the baby rabbits have straight hair.
(a) Use a capital and lower case letter to identify each allele for the gene for curly or
straight hair in rabbits.
(b) Use a Punnett square to show the cross and state the genotypes of the offspring.
(c) If one of these offspring mated with a rabbit with curly hair, use a Punnett square
to find the genotypes and phenotypes of the baby rabbits in the next generation.
13.
(c) What are antibiotics used for? Explain how they work.
(d) Write 2-3 sentences explaining the effects of overprescribing antibiotics.
14. List 4 pieces of evidence that supports evolution
15. The image below shows the separation of DNA
molecules after gel electrophoresis. Based on the
gel electrophoresis, what can be concluded?
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