Genotypes and Inheritance Patterns

The video tutorial explains how to write genotypes on pedigrees by identifying dominant and recessive traits. It outlines the process of assigning recessive genotypes first, followed by dominant genotypes, and provides example problems using traits like dimples and six fingers to illustrate the concepts.

What is the first step in writing genotypes on pedigrees?

• Identify all dominant genotypes

• List all individuals

• Determine the recessive genotypes

• Start with heterozygous individuals

Which of the following is a homozygous dominant genotype?

• Two uppercase letters

• Two lowercase letters

• One uppercase letter

• One uppercase and one lowercase letter

In the dimples example, what is the genotype of individuals without dimples?

• Big D Big D

• Big D

• Big D little d

• Little d little d

Why must both parents be heterozygous if they have a recessive child?

• Because they are both homozygous dominant

• Because they both have dominant traits

• Because they have no dominant alleles

• Because they can pass on a recessive allele

In the six fingers example, what is the dominant trait?

• Six fingers

• Four fingers

• Seven fingers

• Five fingers

What is the genotype of individuals with five fingers in the six fingers example?

• Big G Big G

• Big G little g

• Little g little g

• Big G

Why do we need to consider both dominant genotypes for some individuals?

• Because they are always homozygous

• Because there is not enough information to determine the exact genotype

• Because they have no recessive alleles

• Because they are always heterozygous

What should you do if you cannot determine if an individual is homozygous dominant or heterozygous?

• Ignore the individual

• Assume they are heterozygous

• Assume they are homozygous

• Write both genotypes

In the six fingers example, why must both parents be heterozygous if they have a recessive child?

• Because they can pass on a recessive allele

• Because they are both homozygous dominant

• Because they have no dominant alleles

• Because they both have dominant traits

What is the significance of identifying recessive genotypes first?

• It is the only genotype that matters

• It is easier to identify

• It simplifies the process

• It helps in identifying dominant genotypes