Probability in Genetic Crosses

This video tutorial covers the basics of probability in Mendelian genetics, focusing on Punnett squares and genetic crosses. It explains one-factor and two-factor crosses, calculating probabilities for different genotypes and phenotypes. The video introduces the branch method for simplifying complex probability calculations and discusses the product rule for independent events. It concludes with advanced probability calculations for three-factor crosses, emphasizing the importance of understanding genetic probabilities.

What is the primary tool used to predict genetic cross outcomes in Mendelian genetics?

• Venn Diagram

• Punnett Square

• Line Chart

• Bar Graph

In a one-factor cross with heterozygous parents, what is the probability of offspring having two dominant alleles?

• 3/4

• 1/4

• 1/8

• 1/2

What is the probability of the dominant phenotype in a one-factor cross with heterozygous parents?

• 1/4

• 1/2

• 3/4

• 1

What is the probability of having a dominant phenotype for both genes in a one-factor cross?

• 1/4

• 1/2

• 3/4

• 1

What is the probability of having a recessive phenotype in a one-factor cross?

• 1/4

• 1/2

• 1

• 3/4

What is the probability of having two recessive alleles in a one-factor cross?

• 1/4

• 1/2

• 1

• 3/4

What is the probability of having one dominant and one recessive allele in a one-factor cross?

• 3/4

• 1

• 1/2

• 1/4

What is the probability of having two dominant alleles in a one-factor cross?

• 3/4

• 1/4

• 1/2

• 1

What is the probability of having a dominant phenotype in a one-factor cross?

• 1

• 3/4

• 1/2

• 1/4

In a two-factor cross, how many possible genotypes can result from the cross?

• 8

• 4

• 9

• 16