Question 1

Which of the following best explains why genes that are located close together on the same chromosome tend to be inherited together?

Accepted Answer

They are less likely to be separated by crossing over during meiosis.

Question 2

A geneticist observes that two genes do not assort independently and are often inherited together. Which of the following best describes this phenomenon?

Accepted Answer

Gene linkage

Question 3

If two genes are 10 map units apart on a chromosome, what is the expected recombination frequency between them?

Accepted Answer

$$10\%$$

Question 4

Which of the following is TRUE about sex-linked inheritance?

Accepted Answer

It often results in males expressing recessive X-linked traits more frequently than females.

Question 5

A woman who is a carrier for a recessive X-linked disorder and a man who does not have the disorder have a son. What is the probability that their son will have the disorder?

Accepted Answer

$$50\%$$

Question 6

Which of the following best describes non-nuclear inheritance?

Accepted Answer

Inheritance of traits through mitochondrial or chloroplast DNA.

Question 7

A plant with genotype $$AABB is $$crossed with a plant with genotype $$aabb. If $$the $$F_1$$ generation is self-crossed, and the resulting $$F_2$$ generation shows a phenotypic ratio of $$9:3:3:1$$, what does this indicate?

Accepted Answer

The genes assort independently.

Question 8

Which of the following is an example of polygenic inheritance?

Accepted Answer

Height in humans

Question 9

Which scenario best illustrates environmental effects on phenotype?

Accepted Answer

A Himalayan rabbit's fur color changes depending on the temperature.

Question 10

Which of the following statements about epigenetics is correct?

Accepted Answer

Epigenetics involves chemical modifications that alter gene expression without changing the DNA sequence.

Question 11

A researcher performs a chi-square test to compare observed and expected ratios in a genetic cross. If $$\$$chi^2$$ \u003e$$ Critical Value at $$p=0.05$$, what should the researcher conclude?

Accepted Answer

Reject the null hypothesis; data do not fit Mendelian ratios.

Question 12

Which of the following best describes the purpose of a chi-square test in genetics?

Accepted Answer

To determine if observed data significantly deviates from expected Mendelian ratios.

Question 13

Which of the following is NOT a characteristic of linked genes?

Accepted Answer

They always assort independently.

Question 14

A genetic cross produces offspring with a 1:2:1 phenotypic ratio. Which type of inheritance is most likely involved?

Accepted Answer

Incomplete dominance

Question 15

Which of the following is an example of non-nuclear inheritance in humans?

Accepted Answer

Inheritance of mitochondrial diseases from the mother

Question 16

Which of the following would most likely result in a deviation from the expected Mendelian ratio in a dihybrid cross?

Accepted Answer

Genes are linked and close together on the same chromosome.

Question 17

A scientist observes that a trait is only passed from mothers to all of their children, regardless of the father's genotype. Which type of inheritance is most likely responsible?

Accepted Answer

Mitochondrial inheritance

Question 18

Which of the following best describes the effect of polygenic inheritance on human skin color?

Accepted Answer

It produces a continuous range of phenotypes.

Question 19

Which of the following is a real-world example of environmental effects on gene expression?

Accepted Answer

A Siamese cat's fur color changes depending on body temperature.

Question 20

Which of the following statements about recombination frequency is correct?

Accepted Answer

A recombination frequency of $$50\%$$ indicates that two genes are on different chromosomes.

5.4 Non mendelian genetics

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