Question 1

Which of the following best describes the inheritance pattern shown in the Punnett square image above?

Accepted Answer

Simple dominance, where one allele masks the expression of the other.

Question 2

Based on the Punnett square, what is the expected phenotypic ratio of the offspring if B is dominant for purple flowers and b is recessive for white flowers?

Accepted Answer

$$3:1 ($$purple:white)

Question 3

If the genotype of the pistil is Bb and the pollen is also Bb, what is the probability that an offspring will be homozygous recessive?

Accepted Answer

$$\frac{1}{4}$$

Question 4

Which genotype(s) in the Punnett square will result in the recessive phenotype?

Accepted Answer

bb only

Question 5

If a plant with genotype Bb is self-fertilized, what is the probability that the next generation will have at least one dominant allele?

Accepted Answer

$$\frac{3}{4}$$

Question 6

Which of the following statements is supported by the Punnett square shown?

Accepted Answer

There is a 25% chance of producing a homozygous dominant offspring.

Question 7

If the dominant allele (B) codes for purple flowers and the recessive allele (b) codes for white flowers, what percentage of the F2 generation will have purple flowers?

Accepted Answer

75%

Question 8

What is the genotypic ratio of the offspring produced in the cross shown in the Punnett square?

Accepted Answer

$$1 \ BB : 2 \ Bb : 1 \ bb$$

Question 9

If a plant with genotype BB is crossed with a plant with genotype bb, what will be the genotype of all the offspring?

Accepted Answer

Bb

Question 10

Which of the following best explains why the recessive phenotype appears in the F2 generation but not in the F1 generation in a monohybrid cross?

Accepted Answer

The recessive allele is masked by the dominant allele in heterozygotes.

Mendelian Genetics and Phenotypic Ratios: Step-by-Step Guidance

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