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Probability in Genetic Inheritance Quiz

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#1

Which of the following represents the genotype of an individual with two identical alleles for a particular gene?

Homozygous dominant
Explanation

Having two identical dominant alleles for a gene.

#2

What is the probability of rolling an even number (2, 4, or 6) on a six-sided die?

1/6
Explanation

3 favorable outcomes out of 6 possible outcomes.

#3

In a pedigree chart, what symbol is used to represent an unaffected male?

Square
Explanation

Unaffected male is represented by a square shape.

#4

If two individuals with blood type A have a child, what is the possible blood type of the child?

A
Explanation

Blood type A is determined by the presence of A alleles.

#5

If two heterozygous individuals (Aa) for a trait are crossed, what is the probability of having an offspring with the homozygous recessive genotype (aa)?

1/4
Explanation

1 in 4 chance of getting the homozygous recessive genotype.

#6

What is the probability of having a male child if the father is hemizygous for a sex-linked recessive trait (XY) and the mother is a carrier?

50%
Explanation

Equal chance due to the father's XY sex determination.

#7

In a dihybrid cross, how many different gamete combinations can be produced if both parents are heterozygous for two independent traits?

16
Explanation

4 possible gametes for each trait, multiplied together (4x4).

#8

In a monohybrid cross between two heterozygous individuals, what is the phenotypic ratio of their offspring?

3:1
Explanation

3 offspring with the dominant phenotype to 1 with the recessive phenotype.

#9

What is the term for the phenomenon where one gene can affect multiple phenotypic traits?

Pleiotropy
Explanation

Single gene influencing multiple traits.

#10

What is the probability of rolling a sum of 7 with two six-sided dice?

1/8
Explanation

6 possible ways to get a sum of 7 out of 36 total combinations.

#11

If two parents are carriers for a recessive genetic disorder, what is the probability that their offspring will have the disorder?

25%
Explanation

25% chance of inheriting two recessive alleles.

#12

What is the probability of getting heads on a fair coin flip and rolling a 5 on a six-sided die in two independent events?

1/12
Explanation

Multiply the probabilities of each event: 1/2 x 1/6.

#13

If the probability of having a specific genetic disorder is 1/1000, what is the probability of being a carrier for that disorder in the general population?

1%
Explanation

Complement of the disorder probability: 100% - 1%.

#14

In Mendel's experiments with pea plants, what is the ratio of phenotypes in the F2 generation resulting from a dihybrid cross?

9:3:3:1
Explanation

Phenotypic ratio of offspring with different combinations of traits.

#15

What is the probability of getting tails on a fair coin flip or rolling a 6 on a six-sided die in two independent events?

2/3
Explanation

Sum of individual probabilities: 1/2 + 1/6 = 2/3.

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