29. Heredity
Genetic Disorders
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Practice this topic
- Multiple ChoiceAmniocentesis and chorionic villus sampling are both examples of a category of genetic screening called __________.994views
- Multiple ChoiceThe most common form of fetal testing is __________.892views1rank
- Multiple ChoiceA karyotype is a complete __________.1637views1rank
- Multiple ChoiceHeterozygous individuals that can pass on recessive, abnormal conditions even if they do NOT express the disease are referred to as __________.1209views
- Open Question
Most children with cystic fibrosis are born to normal parents. Children with cystic fibrosis are homozygous for the recessive gene (cc). What can you conclude about the genotypes of the normal parents?
4views - Open Question
The Browns are both carriers of the recessive allele that causes the metabolic disorder called phenylketonuria. What is the probability of each of the following occurring?
(a) All three children will have the disorder.
(b) None of their three children will have the disorder.
(c) One or more of their children will have the disorder.
(d) At least one of their children will be phenotypically normal.
6views - Open Question
A color-blind man marries a woman with normal vision. The woman’s father was also color-blind.
(a) What is the chance that their first child will be a color-blind son? A color-blind daughter?
(b) If they have four children, what is the chance that two will be color-blind sons? (Be careful on this one.)
3views - Open Question
A genetic counselor has been consulted by a couple that is concerned about a dominant form of syndactyly (fused fingers or toes) in the male partner, Paul. Paul has syndactyly, as do his three brothers. His mother, his maternal grandparents, and his paternal grandfather do not have syndactyly, but his father and paternal grandmother do. The counselor constructs a pedigree spanning three generations for Paul’s family. Draw this pedigree and show the phenotype and genotype for each person.
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