Genetics Test Review - Unit 6

Tall pea plants are dominant to short. A scientist crossed a homozygous tall with a heterozygous plant. What genotypes are missing in the Punnett Square?

• TT

• Tt

• tt

• TTTt

Tall pea plants are dominant to short. A scientist crossed a homozygous tall with a heterozygous plant. What is the genotype ratio?

• 2:2:0

• 1:2:1

• 1:1

• 4:0

An organism's genetic makeup

• Genotype

• Phenotype

An organism's physical appearance, or visible traits.

• Genotype

• Phenotype

Passing of characteristics from parent to offspring.

• Gene

• Allele

• Inheritance

• Expression

An organism that has two different alleles for a trait

• Homologous

• Heterozygous

• Dominant

• Recessive

An organism that has two identical alleles for a trait

• Heterozygous

• Dominant

• Recessive

• Homologous

Which of the following is not a Homologous pair

• AT

• TT

• AA

• bb

Red and white are co-dominant in cow fur color. The heterozygote is called roan. Which Punnett square is correct if a Red and White were crossed?

• 
• 
• 
• 

Red and white are incompletely dominant in snapdragon flowers. The heterozygote is pink. What are the predicted genotypes and phenotypes of a white flower crossed with a Red flower?

• WR/ 4 pinks

• WR, WW, and RR/ 2 Pinks, 1 White, and 1 Red

• WR, WW, and RR/ 3 Reds and 1 White

• WR/ 4 Reds