Leaving Cert Biology Genetics, DNA & Evolution: 12
(a) Explain the following ter

Question

12
(a) Explain the following terms used in genetics:

(i) Diploid
(ii) Haploid
(iii) Allele

(b) Read the passage below and answer the questions that follow.

Cystic fibrosis (CF) is caused by a mutated gene and its protein product that causes the body to produce a thick, sticky mucus that clogs the lungs and leads to lung infections. Inhalers and daily physiotherapy help to manage the symptoms of CF. People that do not have CF have at least one dominant gene (N). Some people can be carriers (heterozygous) and not have CF. People with CF have two copies of the mutated gene (n), one inherited from each parent. Genetic screening is available to those over the age of 16 where there is a family history of CF.

(i) What is the cause of cystic fibrosis (CF)?
(ii) State the genotype of each of the following:
1. A person who is a carrier of the CF gene.
2. A person with the CF condition.
3. The possible gametes a carrier can produce.
(iii) Using a Punnett square, determine the percentage chance of two carrier parents having a child with CF.
(iv) What genotype should at least one parent must have to ensure their children do not inherit the CF condition?
(v) What is the purpose of genetic screening?

12 (a) Explain the following terms used in genetics: (i) Diploid (ii) Haploid (iii) Allele (b) Read the passage below and answer the questions that follow - Leaving Cert Biology - Question 12 - 2022

Worked Solution & Example Answer:12 (a) Explain the following terms used in genetics: (i) Diploid (ii) Haploid (iii) Allele (b) Read the passage below and answer the questions that follow - Leaving Cert Biology - Question 12 - 2022

What is the cause of cystic fibrosis (CF)?

State the genotype of each of the following:

Using a Punnett square, determine the percentage chance of two carrier parents having a child with CF.

What genotype should at least one parent must have to ensure their children do not inherit the CF condition?

What is the purpose of genetic screening?

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