Genetic Cross and Recombination Frequency

The video tutorial explains a genetic cross involving two flower traits: flower center color and petal pattern. It discusses the concept of linked genes, which are genes located on the same chromosome, and how they affect the expected phenotypes of offspring. The tutorial identifies parental and recombinant offspring based on phenotype frequencies and demonstrates how to calculate the recombination frequency. A recombination frequency below 50% indicates linked genes, confirming that the genes in question are linked.

What are the two traits being studied in the genetic cross example?

• Flower center color and petal pattern

• Leaf size and stem height

• Root length and leaf color

• Seed shape and plant height

What are the possible phenotypes for the flower centers in the genetic cross?

• Blue and white

• Red and yellow

• Orange and pink

• Green and purple

What are the possible phenotypes for the petals in the genetic cross?

• Long and short

• Solid and spotted

• Striped and dotted

• Curved and straight

What indicates the presence of linked genes in the offspring?

• No variation in phenotype frequencies

• Equal numbers of all phenotypes

• Unexpected variation in phenotype frequencies

• All offspring having the same phenotype

How can you identify parental offspring in a genetic cross?

• By their high frequency

• By their low frequency

• By their color

• By their size

Which offspring are considered recombinant?

• Those with no frequency

• Those with medium frequency

• Those with the lowest frequency

• Those with the highest frequency

What is the formula for calculating recombination frequency?

• Total offspring over number of recombinant offspring

• Number of recombinant offspring over number of parental offspring

• Number of parental offspring over total offspring

• Number of recombinant offspring over total offspring

What is the recombination frequency calculated in the example?

• 30.3%

• 20.5%

• 40.7%

• 50.1%

What does a recombination frequency below 50% indicate?

• Genes are identical

• Genes are on different chromosomes

• Genes are linked

• Genes are not linked

Why is it important to calculate recombination frequency?

• To confirm gene linkage

• To measure the size of the petals

• To identify the height of the plants

• To determine the color of the flowers