Probability in Genetics: Multiplication and Addition Rules

Mr. Andersen discusses the application of multiplication and addition in genetics. He explains how multiplication is used for independent events occurring in sequence, providing examples with coin flips and genetic crosses. Addition is used for mutually exclusive events, illustrated with dice rolls and card picks. The video emphasizes understanding these rules to simplify complex genetic problems.

What is the probability of flipping a coin five times and getting tails each time?

• 1 in 32

• 1 in 64

• 1 in 16

• 1 in 128

If you roll two dice, what is the probability of getting snake eyes?

• 1 in 12

• 1 in 6

• 1 in 36

• 1 in 18

What is the probability of drawing a three from a deck, returning it, and then drawing a king?

• 1 in 256

• 1 in 104

• 1 in 169

• 1 in 52

In a cross between heterozygous pea plants, what is the probability of obtaining a homozygous recessive offspring?

• 1 in 5

• 1 in 2

• 1 in 4

• 1 in 3

What is the probability of rolling a two or a five on a six-sided die?

• 1 in 4

• 1 in 2

• 1 in 6

• 1 in 3

What is the probability of drawing a five or a heart from a deck of cards?

• 1 in 4

• 1 in 26

• 4 in 13

• 1 in 13

When using the rule of addition, what is the probability of getting either a heads or tails in a coin flip?

• 1 in 1

• 1 in 2

• 1 in 3

• 1 in 4

In a genetic cross, what is the probability of obtaining a heterozygous offspring?

• 1 in 2

• 1 in 5

• 1 in 4

• 1 in 3

In a trihybrid cross, what is the probability of obtaining a specific genotype using multiplication?

• 1 in 4

• 1 in 8

• 1 in 16

• 1 in 32

In a complex genetic cross, what is the probability of obtaining either of two specific genotypes?

• 1 in 4

• 1 in 16

• 1 in 8

• 1 in 12