Question 1

Which of the following best defines an allele?

Accepted Answer

A specific version of a gene found at a particular locus on a chromosome.

Question 2

In horses, black coat color (B) is dominant to chestnut (b). What are the possible genotypes for a black-coated horse?

Accepted Answer

$$BB$$ and $$Bb$$

Question 3

If a guinea pig has the genotype $$Ll$$ for hair length, what is its phenotype?

Accepted Answer

Long hair

Question 4

Which term describes an individual with two different alleles for a trait?

Accepted Answer

Heterozygous

Question 5

A carrier for a recessive genetic disorder is best described as:

Accepted Answer

Heterozygous for the trait

Question 6

Which inheritance pattern results in a heterozygous individual displaying both traits equally?

Accepted Answer

Co-dominance

Question 7

In dragons, having wings (W) is dominant to not having wings (w). If a heterozygous winged dragon ($$Ww) is $$crossed with a non-winged dragon ($$ww$$), what percentage of their offspring will have wings?

Accepted Answer

$$50\%$$

Question 8

A female dragon is homozygous for wings ($$WW) $$and heterozygous for green scales ($$Gg). $$What are the possible gametes she can produce?

Accepted Answer

$$WG$$ \ and \ $$Wg$$

Question 9

Which statement best explains the relationship between genotype and phenotype?

Accepted Answer

The genotype determines the phenotype by coding for specific proteins that result in observable traits.

Question 10

Can you always determine a person’s genotype from their phenotype? Why or why not?

Accepted Answer

No, because dominant phenotypes can result from either homozygous dominant or heterozygous genotypes.

Question 11

In humans, blood types exhibit co-dominance. If one parent is type O ($$ii) $$and the other is heterozygous for type A ($$I^A i$$), what are the possible blood types for their child?

Accepted Answer

Type A and Type O

Question 12

In 4’o clock plants, flower color shows incomplete dominance. If a purple flower ($$BR) is $$crossed with a red flower ($$RR$$), what are the possible phenotypes of the offspring?

Accepted Answer

Purple and Red

Question 13

Red-green colorblindness is a recessive X-linked trait. If a colorblind male ($$X^cY) $$has a child with a female who is not a carrier ($$X^CX^C$$), what is the probability that their son will be colorblind?

Accepted Answer

$$0\%$$

Question 14

A pedigree shows a recessive condition (r). If individual III-8 (carrier, $$Rr) $$has a child with someone who is also a carrier ($$Rr$$), what is the probability their child will have the condition?

Accepted Answer

$$25\%$$

Question 15

Which of the following best describes a pedigree?

Accepted Answer

A diagram that shows the inheritance of a trait through several generations of a family.

Question 16

Which of the following is an example of incomplete dominance?

Accepted Answer

A cross between red and white flowers producing pink flowers.

Question 17

Which of the following is true about sex-linked traits?

Accepted Answer

They are often found on the X chromosome and can affect males more frequently than females.

Question 18

If a trait is controlled by complete dominance, what phenotype will a heterozygous individual display?

Accepted Answer

The dominant phenotype

Question 19

Which genotype represents a homozygous individual?

Accepted Answer

$$AA or$$ $$aa$$

Question 20

Which of the following best describes a gene?

Accepted Answer

A segment of DNA that codes for a specific protein or trait.

Genetics Review: Pedigree Analysis and Mendelian Genetics

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