Types of Dominance

Which statement best describes Mendelian or complete dominance?

• When the dominant and recessive alleles mix to form a third phenotype.

• When both the dominant and recessive allele shows.

• When the dominant trait or allele completely masks the recessive allele.

Which of these best describes incomplete dominance?

• When both the dominant and recessive allele express a phenotype (like spots).

• When the dominant allele does NOT completely cover up the recessive allele and they MIX creating a third phenotype.

• When the dominant allele covers up the recessive allele.

If you cross a red snapdragon with a white snapdragon what phenotype should you expect in 100% of the offspring if snapdragon flowers are expressed via incomplete dominance?

• Pink

• Rr

• Red

• White

What is the difference between incomplete dominance and codominance?

• In codominance, the traits are mixed, in incomplete dominance the traits are both expressed. 

• In codominance, both alleles are expressed, while in incomplete dominance the alleles mix to create a 3rd variation of the trait.

• The dominant allele completely masks the recessive allele. 

Which of the following describes the genotype if you crossed two black and white (BW) chickens?

• 100% BW

• 50% black

  50% white

• 100% black and white

• 50% BW 

  25% WW

  25% BB

Which is incomplete dominance?

• both alleles are expressed

• the inbetween phenotype

Skin color and height are polygenic traits which means 

• one gene codes for each trait

• many genes code for one trait

Both environmental and genetic factors influence height and skin color.

• false

• true