Dihybrid Cross Probability and Genotypes

The video tutorial explains the genetic inheritance of eye and body color traits in flies, focusing on dominant and recessive alleles. It demonstrates how to set up and use Punnett squares to predict the genotypes of offspring from a specific mating pair. The tutorial calculates the probability of offspring having a particular genotype, emphasizing the multiplication of probabilities in dihybrid crosses.

What is the dominant eye color in flies according to the video?

• Brown

• Green

• Red

• Yellow

Which body color is dominant in the flies discussed?

• Green

• Red

• Brown

• Yellow

What is the genotype of the first parent fly?

• big R big R big B big B

• little r little r big B little b

• little r little r little b little b

• big R big R big B little b

What is the genotype of the second parent fly?

• big R big R big B big B

• little r little r big B little b

• little r little r little b little b

• big R big R big B little b

How many Punnett squares are needed for this dihybrid cross?

• Two

• Four

• Three

• One

What is the probability of the offspring being heterozygous for eye color?

• 100%

• 25%

• 50%

• 0%

What is the probability of the offspring being homozygous dominant for body color?

• 100%

• 25%

• 0%

• 50%

How do you calculate the overall probability of a specific genotype in a dihybrid cross?

• Multiply the probabilities

• Divide the probabilities

• Subtract the probabilities

• Add the probabilities

What is the final probability of the offspring having the genotype big R little r big B big B?

• 50%

• 0%

• 75%

• 25%

Why is multiplying by 100% equivalent to multiplying by one?

• Because it is a standard rule

• Because it simplifies calculations

• Because it doesn't change the value

• Because 100% is a whole