Question 1

According to Mendel’s laws, what is the probability of obtaining a heterozygous offspring (Rr) from a cross between two heterozygous parents (Rr x Rr)?

Accepted Answer

$$\frac{1}{2}$$ + $$\frac{1}{4}$$

Question 2

If a plant with genotype PpYy is self-crossed, what is the probability that an offspring will have the genotype ppYy?

Accepted Answer

$$\frac{1}{16}$$

Question 3

Which of the following best describes the law of independent assortment?

Accepted Answer

Alleles for different genes segregate independently during gamete formation.

Question 4

A heterozygous plant (RrYy) is crossed with a homozygous recessive plant (rryy). What is the probability that the offspring will have round seeds and yellow color (R_Y_)?

Accepted Answer

$$\frac{1}{4}$$

Question 5

If the probability of a gamete carrying allele R is $$\frac{1}{2}$$ and carrying allele Y is $$\frac{1}{2}$$, what is the probability of a gamete carrying both R and Y?

Accepted Answer

$$\frac{1}{4}$$

Question 6

Which rule would you use to determine the probability of an offspring inheriting two independent traits simultaneously?

Accepted Answer

Multiplication rule

Question 7

In a cross between PpYy x PpYy, what is the probability of obtaining an offspring with genotype PPYY?

Accepted Answer

$$\frac{1}{16}$$

Question 8

If the probability of a plant being tall (T) is $$\frac{3}{4}$$ and the probability of it having yellow seeds (Y) is $$\frac{3}{4}$$, what is the probability that a plant will be tall and have yellow seeds?

Accepted Answer

$$\frac{9}{16}$$

Question 9

Which of the following scenarios best illustrates the addition rule of probability in genetics?

Accepted Answer

Calculating the probability of an offspring being either homozygous dominant or heterozygous for a trait.

Question 10

A cross between two heterozygous plants (Pp x Pp) results in which probability for a homozygous recessive offspring?

Accepted Answer

$$\frac{1}{4}$$

Question 11

If a plant is heterozygous for three traits (AaBbCc), what is the probability that a gamete will carry all recessive alleles (abc)?

Accepted Answer

$$\frac{1}{8}$$

Question 12

Which of the following best explains why Mendel’s predictions matched the observed ratios in large numbers of offspring?

Accepted Answer

The larger the sample size, the closer the results will conform to predictions due to the laws of probability.

Question 13

In a dihybrid cross (YyRr x YyRr), what is the probability of obtaining an offspring with the genotype yyrr?

Accepted Answer

$$\frac{1}{16}$$

Question 14

Which of the following is NOT a requirement for using the multiplication rule in genetics?

Accepted Answer

The events must be mutually exclusive.

Question 15

If the probability of a pea plant producing a round seed is $$\frac{3}{4}$$ and the probability of producing a yellow seed is $$\frac{3}{4}$$, what is the probability of producing a wrinkled, green seed?

Accepted Answer

$$\frac{1}{16}$$

Question 16

A geneticist wants to know the probability of an offspring being either homozygous dominant or homozygous recessive for a single trait. Which rule should be applied?

Accepted Answer

Addition rule

Probability and Mendelian Genetics: Laws, Rules, and Applications

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