About Plant genetics

Plant genetics is the study of how genes affect plant characteristics, such as flower color and shape. Plants use two main categories of genes: dominant and recessive. Dominant genes are the most common type, and they make a large impact on the plant’s phenotype, or observable traits. For example, a dominant gene that makes a plant tall would be expressed while a recessive gene that makes a plant short would not be expressed. On the other hand, recessive genes do not make much of an impact on the phenotype; they just happen to occur together in a single plant. These genes are called “recessive” because they only affect traits that are already present in the plant.

In order for a flower to have red flowers, it needs to have both dominant red-flower-making genes and recessive yellow-flower-making genes. Since both are needed for the phenotype to be visible, crosses between plants with dominant red-flower-making genes and yellow-flower-making genes would produce offspring with both types of flowers to make them more visible. Similarly, crosses between plants with both types of flowers would also produce offspring with both types of flowers to blend in better with their surroundings. Essentially, genetic inheritance is all about how traits are passed down from parent to offspring.

Following are some of the multiple choice questions on the Plant genetics with answers that will help the students in developing their knowledge.

Plant genetics MCQ

1. Red (R) is dominant over white (r). How can a flower be white?

  • It can have RR and be white.
  • It has to have rr.
  • It has to have rR
  • There is no way it can be white until the third generation.

2. What type of inheritance do two alleles have if their traits blend together? 

  • Incomplete Dominance
  • Co-Dominance
  • Mendelian Inheritance
  • Homozygous Inheritance

3. A plant shows incomplete dominance in size. A tall plant (TT) is crossed with a medium plant (TS). What fraction of plants will also be tall?

  • 100 %
  • 75%
  • 50%
  • 25%

4. What gender has an X and a Y chromosome?

  • male
  • female
  • transgender 
  • all of the above

5. An organism with two different alleles for a trait is said to be...

  • recessive
  • dominant
  • hybrid
  • purebred

6. An individual has the phenotype Bb. Will they express the dominant or recessive trait?

  • Recessive
  • Dominant

7. What is the genotype for a pea plant heterozygous for round seeds (R), and homozygous recessive for green seeds (y)?

  • Ry
  • RRyy
  • RrYy
  • Rryy

8. Cross Two Homozygous plants (RRYY x rryy)R = round seeds, r  = wrinkled seeds Y = yellow seeds, y = green seedsWhat percent will have Round and Yellow seeds? 

  • 0%
  • 25%
  • 50%
  • 100%

9. For haemophilia, let H be the normal allele and h the mutant allele.Which is the genotype of the unaffected male?

  • XhY
  • XHXH
  • XHXh
  • XHY

10. Color blindness is carried by the X chromosome.A mother is a carrier of color blindness. Her husband has normal vision.The probability of having a color blind offspring is _____ percent.

  • 50
  • 25
  • 75
  • 100

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