Genetic Crosses Quiz (Chapter 23)

What is the term used for a genetic cross involving only one trait?

• Co-Dominance

• Dihybrid

• Incomplete Dominance

• Monohybrid

Answer explanation

Monohybrid is the term used for a genetic cross involving only one trait. It is the correct choice because it refers to the specific type of cross being described in the question.

Which type of genetic cross shows complete dominance?

• Incomplete Dominance

• Co-Dominance

• Dihybrid

• Monohybrid

Answer explanation

Monohybrid cross shows complete dominance.

In an incomplete dominance cross, what is the phenotype of a heterozygous genotype?

• No traits expressed

• Dominant trait

• Recessive trait

• Blend of traits

Answer explanation

In an incomplete dominance cross, a heterozygous genotype results in a blend of traits.

What is the term used for a genetic cross involving two traits?

• Dihybrid

• Incomplete Dominance

• Monohybrid

• Co-Dominance

Answer explanation

A genetic cross involving two traits is called a dihybrid cross. This term refers to the inheritance of two different traits simultaneously.

Which law states that the traits in a dihybrid cross are not dependent on each other?

• Law of Dominance

• Law of Independent Assortment

• Law of Segregation

• Law of Genetic Variation

Answer explanation

The Law of Independent Assortment states that the traits in a dihybrid cross are not dependent on each other.

In co-dominance, if an organism has the genotype FBFW, what will be the phenotype?

• Black feathers

• White feathers

• Both black and white feathers

• No feathers

Answer explanation

The phenotype of an organism with the genotype FBFW in co-dominance is both black and white feathers.

Tags

NGSS.HS-LS3-1

What is the key difference between co-dominance and incomplete dominance?

• In co-dominance, both traits are expressed fully, while in incomplete dominance, traits blend together

• In co-dominance, traits blend together, while in incomplete dominance, both traits are expressed fully

• In co-dominance, one trait is dominant, while in incomplete dominance, both traits are expressed fully

• In co-dominance, both traits are recessive, while in incomplete dominance, one trait is dominant

Answer explanation

Co-dominance is when both traits are fully expressed, while incomplete dominance is when traits blend together. The correct choice is that in co-dominance, both traits are expressed fully, while in incomplete dominance, traits blend together.

What is the possible genotype of an organism showing co-dominance for two traits represented by the letters F and G?

• FFGG

• FG

• FF or GG

• FGFG

Answer explanation

The possible genotype of an organism showing co-dominance for two traits represented by the letters F and G is FGFG. This genotype represents the co-dominant expression of both traits.

What is the term used to describe the situation where the heterozygote expresses both traits simultaneously?

• Co-Dominance

• Incomplete Dominance

• Monohybrid

• Dihybrid

Answer explanation

Co-Dominance is the term used to describe the situation where the heterozygote expresses both traits simultaneously.

What is the phenotype of an organism with the genotype RR in a complete dominance scenario?

• Recessive trait

• Dominant trait

• Blend of traits

• No traits expressed

Answer explanation

In a complete dominance scenario, the phenotype of an organism with the genotype RR is the dominant trait.