0c8746df-cde1-4e3e-a08d-9ef0ebeb0a3c","revisionId":"7f1df1c3-eb75-4847-a9d3-d504d85e908f","questionNumber":null,"questionType":"LA","specification":"In fruit flies (*Drosophila melanogaster*), the inheritance of wing type is controlled by a single gene with two alleles. The allele for normal wings (\$V\$) is dominant to the allele for vestigial wings (\$v\$).","difficulty":3,"difficultyBand":"easy","totalMarks":4,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"553d8990-171a-4dc5-9a20-291c152aa969","label":"a","content":"In a first cross, a heterozygous parent mates with a homozygous recessive parent.\n\nState the genotypes of both parents.","markscheme":"- States the genotypes of both parents as $Vv$ and $vv$ B1","marks":1,"order":0,"markingRubric":null,"explanation":null,"options":[]},{"id":"3b0835b7-6b52-45d8-9010-b2edcd8ab123","label":"b","content":"State the potential phenotypes of the offspring from this cross.","markscheme":"- Identifies the potential offspring phenotypes as normal wings and vestigial wings B1","marks":1,"order":1,"markingRubric":null,"explanation":null,"options":[]},{"id":"2772018b-4a7f-4a0e-8ac4-91e825ef7d88","label":"c","content":"In a second cross, two heterozygous fruit flies (\$Vv\$) mate.\n\nState all the possible genotypes of their offspring.","markscheme":"- States the possible genotypes of the offspring as $VV$, $Vv$, and $vv$ B1","marks":1,"order":2,"markingRubric":null,"explanation":null,"options":[]},{"id":"63ffc015-8875-4e95-9f73-dafbc2f0c3e0","label":"d","content":"Calculate the probability that a single offspring from this second cross will have normal wings. Give your answer as a percentage, fraction, or decimal.","markscheme":"- Calculates the probability of normal wings as $75\\%$ (or $\\frac{3}{4}$ or $0.75$) B1","marks":1,"order":3,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"32d02e99-3517-4442-9176-b5d414d677df","revisionId":"2cc2aadb-eec8-4d61-9b6b-727738abc06d","questionNumber":null,"questionType":"LA","specification":"The passage describes natural selection.\n\nComplete the passage by writing a suitable word in each of the spaces.","difficulty":2,"difficultyBand":"easy","totalMarks":4,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"74f52225-3901-40f5-b4fa-9a75ba794422","label":null,"content":"* Natural selection starts with variation within a population, which is caused by genetic ______.\n* Individuals with beneficial characteristics are more likely to ______ and reproduce.\n* These individuals pass on their advantageous alleles to their ______.\n* This process is repeated over many generations, eventually leading to ______.","markscheme":"- Identifies **mutation** (or genetic **variation**) B1\n- Identifies **survive** (or **live**) B1\n- Identifies **offspring** (or **descendants**) B1\n- Identifies **evolution** (or **adaptation** / **speciation**) B1","marks":4,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"4ddc25dc-db4e-416e-8ecd-2481af89848b","revisionId":"f9595b98-5b65-48f9-8168-42bded8c3c43","questionNumber":null,"questionType":"LA","specification":"In guinea pigs, the inheritance of coat texture is controlled by a gene with two alleles. The allele for a rough coat ($R$) is dominant to the allele for a smooth coat ($r$).","difficulty":3,"difficultyBand":"easy","totalMarks":4,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"2b66f3c2-bfa7-4134-81c8-e7aad0d9c97d","label":"a","content":"In a first cross, a heterozygous parent mates with a homozygous recessive parent.\n\nState the genotypes of both parents.","markscheme":"- Identifies parent genotypes as $Rr$ and $rr$ B1","marks":1,"order":0,"markingRubric":null,"explanation":null,"options":[]},{"id":"9fa559f4-fc68-404f-b460-a163602bc292","label":"b","content":"State the potential phenotypes of t

Inheritance

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Inheritance Questions

Inheritance

Question 2

Inheritance Questions