Question 1

Which of the following best describes the difference between incomplete dominance and codominance in patterns of inheritance?

Accepted Answer

In incomplete dominance, the heterozygote shows a blend of the two parental phenotypes, while in codominance, both parental phenotypes are fully and separately expressed.

Question 2

A man with hemophilia (an X-linked recessive disorder) and blood type O (genotype ii) has children with a woman who does not have the allele for hemophilia and is heterozygous for blood type B (genotype IBi). What is the probability that a daughter will be a carrier for hemophilia and have blood type O?

Accepted Answer

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

Question 3

Which of the following best explains why Mendelian genetics are often referred to as 'simple' inheritance?

Accepted Answer

Because in heterozygotes, only the dominant allele is expressed in the phenotype, making prediction straightforward.

Question 4

Human blood type is an example of which of the following patterns of inheritance?

Accepted Answer

Codominance, multiple alleles, and dominant/recessive inheritance

Question 5

If a plant with genotype $$RR ($$red flowers) is crossed with a plant with genotype $$WW ($$white flowers), and the trait is inherited through incomplete dominance, what will be the phenotype of the $$F_1$$ generation?

Accepted Answer

All pink flowers

Question 6

A dihybrid cross is performed between two individuals heterozygous for both traits ($$AaBb 	imes AaBb$$), where the genes are unlinked. What is the expected phenotypic ratio among the offspring?

Accepted Answer

$$9:3:3:1$$

Question 7

In a pedigree, both parents are unaffected by a genetic disorder, but one of their children is affected. Which pattern of inheritance is most likely?

Accepted Answer

Autosomal recessive

Question 8

Which of the following statements about polygenic inheritance is correct?

Accepted Answer

Polygenic traits show a continuous range of phenotypes due to the additive effects of multiple genes.

Question 9

Which of the following best explains why the law of independent assortment applies to genes on different chromosomes?

Accepted Answer

Because during meiosis, homologous chromosomes are separated randomly, allowing alleles of different genes to assort independently.

Question 10

A pedigree shows a trait that appears in every generation and affects both males and females equally. What is the most likely mode of inheritance?

Accepted Answer

Autosomal dominant

Question 11

Which of the following is a key ethical consideration in genetic testing for inherited diseases?

Accepted Answer

Protecting the privacy and confidentiality of genetic information

Question 12

Which of the following best explains why a genotype is not always a perfect predictor of phenotype?

Accepted Answer

Because environmental factors can influence the expression of genes

Question 13

How did the Human Genome Project contribute to our understanding of genetic disorders?

Accepted Answer

By identifying the complete sequence of human DNA, allowing researchers to locate genes associated with specific disorders

Question 14

If a gene has three alleles ($$A$$, $$B$$, and $$C$$), how many possible genotypes can exist for this gene in a diploid organism?

Accepted Answer

6

Question 15

Which of the following scenarios best illustrates codominance?

Accepted Answer

A person with blood type AB expresses both A and B antigens on their red blood cells.

Question 16

During meiosis, what is the primary reason that linked genes do not assort independently?

Accepted Answer

Because they are located close together on the same chromosome and tend to be inherited together

Question 17

A woman who is heterozygous for a recessive X-linked disorder has children with a man who does not have the disorder. What is the probability that a son will have the disorder?

Accepted Answer

$$\frac{1}{2}$$

Question 18

Which of the following best describes the law of segregation as it applies to gamete formation?

Accepted Answer

Each gamete receives only one allele for each gene.

Question 19

A genetic disorder is only observed in males in a pedigree and is passed from affected fathers to all their sons. What is the most likely mode of inheritance?

Accepted Answer

Y-linked

Question 20

Which of the following is an example of a polygenic trait in humans?

Accepted Answer

Height

Genetics Unit Review: Mendelian and Non-Mendelian Inheritance, Genetic Crosses, Pedigrees, and Genetic Research

Guida di studio - Domande di pratica

Study guide - Flashcard