BSAA Plant Genetics Test

What is the basic unit of heredity in living organisms?

• Chromosome

• Gene

• DNA

• Protein

Which of the following describes a phenotype?

• The genetic makeup of an organism

• The physical appearance of an organism

• The sequence of DNA

• The number of chromosomes

In a monohybrid cross, what is the expected phenotypic ratio of the offspring when both parents are heterozygous for a trait?

• 1:1

• 3:1

• 9:3:3:1

• 1:2:1

What is the purpose of a Punnett square in genetics?

• To determine the exact genetic makeup of an organism

• To predict the probability of offspring inheriting particular traits

• To sequence DNA

• To identify mutations in genes

In Mendelian inheritance, what does it mean if a trait is recessive?

• It is always expressed in the phenotype

• It is masked by a dominant trait

• It is more common in the population

• It is only found in males

If a plant with a homozygous dominant genotype is crossed with a heterozygous plant, what is the probability of the offspring being homozygous dominant?

• 0%

• 25%

• 50%

• 100%

In a Punnett square, what do the letters outside the grid represent?

• The phenotypes of the offspring

• The genotypes of the offspring

• The alleles of the parents

• The number of chromosomes

How does a Punnett square help in understanding plant trait variations?

• It shows the exact traits of the offspring

• It predicts the probability of different trait combinations

• It determines the dominant trait

• It identifies genetic mutations