ET Non mendelian genetics 3/24/25

Which of these describes the Law of Dominance?

• Genes for different traits sort independently of each other during gamete formation.

• Alleles separate from each other during gamete formation.

• Some traits are dominant and others are recessive. Dominant traits are coded by dominant alleles.

• In a heterozygous condition, the dominant trait will mask the presence of the recessive trait, resulting in only the dominant trait being expressed in the phenotype

What do we call traits that are controlled by more than one gene?

• Multicellular traits

• Polygenic traits

• Sex-linked traits

• Genotypic traits

A red flowered plant (RR) breeds with a White flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance.  What percentage of the offspring will have pink (RW) flowers?

• 0%

• 25%

• 50%

• 100%

Snap dragon color is a incomplete dominant trait.  A red flower (RR) is crossed with white flower (rr)? What color are flowers that are Rr?

• Red
• Red and White
• White
• Pink

In butterfly bushes, dark purple and pink parents will produce offspring with lavender flowers. This is a result of 

• codominance
• incomplete dominance
• complete dominance
• recessive dominance

Tags

NGSS.MS-LS3-2

Some flowers are controlled by codominance. Red flowers (RR), blue flowers (BB) and Speckled flowers (RB).

Cross a red flower with a speckled flower. What is the phenotypic ratio?

• 2 red, 2 speckled

• 2 red, 2 blue

• 2 blue, 2 speckled

• All speckled