GCSE Biology - Why We Inherit Diseases From Our Family - Polydactyly & Cystic Fibrosis #75

The video tutorial discusses inherited disorders, focusing on polydactyly and cystic fibrosis. Polydactyly is caused by a dominant allele, while cystic fibrosis is due to a recessive allele. Genetic diagrams illustrate how these conditions are inherited. The video also covers embryo screening, a process to detect genetic disorders in embryos, and discusses its ethical implications, including potential benefits and concerns.

What is the genetic cause of polydactyly?

• A recessive allele

• A mutation in the X chromosome

• A mutation in the Y chromosome

• A dominant allele

In a genetic diagram crossing a heterozygous polydactyly individual with a homozygous normal individual, what is the probability of having a polydactyly offspring?

• 25%

• 75%

• 100%

• 50%

What is required for an individual to have cystic fibrosis?

• Two recessive alleles

• One recessive allele

• Two dominant alleles

• One dominant allele

What is the phenotype ratio when two carriers of cystic fibrosis are crossed?

• 4:1

• 1:1

• 3:1

• 2:1

What is the purpose of embryo screening in IVF?

• To determine the gender of the embryo

• To check for genetic disorders

• To enhance the physical traits of the embryo

• To increase the number of embryos

Which of the following is a potential benefit of embryo screening?

• Higher costs for genetic treatments

• Screening for non-medical traits

• Increased prejudice against healthy individuals

• Reduced overall suffering from genetic disorders

What is a concern associated with embryo screening?

• It may lead to increased genetic diversity

• It could imply that people with genetic disorders are less desirable

• It guarantees the birth of a healthy child

• It is a cost-effective process