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B6: Quiz 6
B6: Quiz 6
1) This question is all about cystic fibrosis.
a)
i) Is cystic fibrosis caused by a dominant or recessive allele?
ii) What is the only genotype for having cystic fibrosis?
b)
i) Give a definition for being a carrier of cystic fibrosis.
ii) What is the genotype for a carrier of cystic fibrosis?
c) Two carriers for cystic fibrosis have a child.
i) Complete the Punnet square below to show the possible genetic outcomes for the offspring.
a)
i) Is cystic fibrosis caused by a dominant or recessive allele?
ii) What is the only genotype for having cystic fibrosis?
b)
i) Give a definition for being a carrier of cystic fibrosis.
ii) What is the genotype for a carrier of cystic fibrosis?
c) Two carriers for cystic fibrosis have a child.
i) Complete the Punnet square below to show the possible genetic outcomes for the offspring.
ii) Give the ratio of the offspring that have cystic fibrosis to the offspring that do not have cystic fibrosis.
ii) How many of the offspring are carriers?
d) A homozygous dominant individual and a carrier of cystic fibrosis have a child. Use a Punnett square to work out the percentage chance that the offspring will have cystic fibrosis.
2)
a)
i) What is polydactyly?
ii) Is it caused by a dominant or recessive allele?
iii) What are the two genotypes for individuals that have polydactyly?
iv) What is the only genotype for individuals that do not have polydactyly?
b) A heterozygous individual has a child with an individual that does not have polydactyly.
i) Draw the Punnett square to show the possible genetic outcomes for the offspring.
ii) How many of the offspring are carriers?
d) A homozygous dominant individual and a carrier of cystic fibrosis have a child. Use a Punnett square to work out the percentage chance that the offspring will have cystic fibrosis.
2)
a)
i) What is polydactyly?
ii) Is it caused by a dominant or recessive allele?
iii) What are the two genotypes for individuals that have polydactyly?
iv) What is the only genotype for individuals that do not have polydactyly?
b) A heterozygous individual has a child with an individual that does not have polydactyly.
i) Draw the Punnett square to show the possible genetic outcomes for the offspring.
ii) Give the ratio of the number of individuals that have polydactyly to the number of individuals that do not have polydactyly.
c) A homozygous recessive individual has a child with a homozygous dominant individual. What percentage of the offspring will have polydactyly?
3) We can screen embryos for genetic disorders.
a) Briefly explain the process for screening embryos for genetic disorders.
b) Give 2 positives for screening embryos for genetic disorders.
c) Give 2 negatives for screening embryos for genetic disorders.
c) A homozygous recessive individual has a child with a homozygous dominant individual. What percentage of the offspring will have polydactyly?
3) We can screen embryos for genetic disorders.
a) Briefly explain the process for screening embryos for genetic disorders.
b) Give 2 positives for screening embryos for genetic disorders.
c) Give 2 negatives for screening embryos for genetic disorders.