Q: Which formula correctly estimates the probability of detecting a Bb carrier bull after $$n$$ test crosses with cows of mixed genotypes?

$$P(\text{detect } Bb) = 1 - [f(BB) + 3/4 f(Bb) + 1/2 f(bb)]^n$$

Question 1

Which of the following is NOT an assumption of Hardy-Weinberg equilibrium?

Accepted Answer

No random mating

Question 2

In a population where $$p = 0.6$$ and $$q = 0.4$$, what is the expected frequency of heterozygotes ($$Aa) $$under Hardy-Weinberg equilibrium?

Accepted Answer

$$0.48$$

Question 3

If the frequency of the recessive genotype $$aa in a $$population is $$0.01$$, what is the estimated frequency of allele $$a$$ ($$q) $$assuming Hardy-Weinberg equilibrium?

Accepted Answer

$$q = \sqrt{0.01} = 0.1$$

Question 4

Why is Hardy-Weinberg equilibrium considered a 'utopian state' in population genetics?

Accepted Answer

Because most populations break one or more of its assumptions

Question 5

Given a population with genotype frequencies $$f(AA) = 0.36$$, $$f(Aa) = 0.48$$, and $$f(aa) = 0.16$$, what are the allele frequencies $$p$$ and $$q$$?

Accepted Answer

$$p = 0.6$$, $$q = 0.4$$

Question 6

If a Black Angus bull of unknown genotype (BB or Bb) is test-mated to a Red Angus cow (bb), what is the probability of producing a red calf if the bull is a Bb carrier?

Accepted Answer

$$0.5$$

Question 7

After $$n$$ test crosses between a Bb bull and bb cows, all resulting in black calves, what is the probability that the bull is still a Bb carrier?

Accepted Answer

$$(1/2)^n$$

Question 8

Which formula correctly estimates the probability of detecting a Bb carrier bull after $$n$$ test crosses with cows of mixed genotypes?

Accepted Answer

$$P(	ext{detect } Bb) = 1 - [f(BB) + 3/4 f(Bb) + 1/2 f(bb)]^n$$

Question 9

In a population, if $$f(aa) = 0.01$$ and $$f(Aa) = 0.18$$, what is the correct formula to estimate $$q$$?

Accepted Answer

$$q = f(aa) + 1/2 f(Aa)$$

Question 10

Which of the following best explains why Hardy-Weinberg equilibrium is still taught despite being rarely observed in nature?

Accepted Answer

It provides a useful framework for understanding the effects of selection, mutation, and migration

Question 11

In mammals, which sex chromosome combination is correct for males and females?

Accepted Answer

Males: XY, Females: XX

Question 12

If the allele frequency in males in generation 0 is $$p_m = 0.3$$ and in females $$p_f = 0.6$$, what is the average allele frequency $$\bar{p}$$?

Accepted Answer

$$\bar{p} = \frac{0.3 + 0.6}{2} = 0.45$$

Question 13

In avian species, which sex is the heterogametic sex?

Accepted Answer

Female (ZW)

Question 14

If a population is not in Hardy-Weinberg equilibrium, which of the following could be a possible cause?

Accepted Answer

Non-random mating

Question 15

Given the following genotype frequencies in females: $$f(AA) = 0.36$$, $$f(Aa) = 0.48$$, $$f(aa) = 0.16$$, and in males: $$f(A_) = 0.5$$, $$f(a_) = 0.5$$, what is the expected frequency of $$Aa$$ daughters from a mating between these parents?

Accepted Answer

$$0.48$$

Question 16

Which equation is used to calculate the allele frequency $$p$$ from genotype frequencies?

Accepted Answer

$$p = P + \frac{1}{2}H$$

Question 17

If a Bb bull is mated to 8 cows, half of which are Bb and half are bb, what is the probability of detecting the Bb carrier status after all calves are born black?

Accepted Answer

$$1 - [3/4 (1/2) + 1/2 (1/2)]^8 \approx 0.98$$

Question 18

In sex-linked inheritance in mammals, what is the relationship between allele frequencies in males and females in the next generation?

Accepted Answer

Frequency in males equals previous frequency in females

Question 19

Which of the following is a correct application of the Punnett square in random mating populations?

Accepted Answer

It predicts genotypic frequencies using allele frequencies

Hardy-Weinberg Equilibrium and Sex Linkage: Principles and Applications in Genetics

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