Ploidy

In human gametes, the haploid number of chromosomes is

(a)  

• 23

• 46

• 69

• 92

What morphological difference was observed on the leaf surface of Arabidopsis plants with different ploidy levels?

• Color changes in the leaves.

• Development of thorns on the leaves.

• Microscopic hairs (trichome) that get more branches when ploidy increases.

• Increase in leaf thickness.

What is the ploidy level of the Arabidopsis plants that the researchers generated in the laboratory, besides the diploid ones?

• Monoploid and triploid

• Tetraploid and hexaploid

• Tetraploid and octoploid

• Hexaploid and decaploid

When ploidy doubles in plant organs, how does the cell area change according to the researchers?

• It doubles exactly.

• It increases by ~1.7x.

• It decreases proportionally.

• It remains the same.

According to the text, what is the proportional relationship in ploidy?

• Ploidy has a proportional relationship with nuclear size and organ size.

• Ploidy has a proportional relationship with cell number and nuclear size.

• Ploidy has a proportional relationship with cell size and cell number.

• Ploidy has a proportional relationship with organ size and cell number.

What is the current hypothesis about how plants sense their ploidy and regulate their size?

• Plants use chemical signals from the environment to determine their size.

• Plants have a fixed size that cannot be altered regardless of their ploidy.

• Plants understand how big they are supposed to be, and they have mechanisms to regulate their size.

• Plants rely on random mutations to determine their final size.

Tags

NGSS.HS-LS1-4

Which of the following is true about the ploidy levels in some crop plants?

• Increasing the ploidy levels has no effect on the ultimate size of the plant.

• Decreasing the ploidy levels is the only way to increase the size of the plant.

• Scientists have created 32-ploid strawberries, which are smaller than the commercial octoploid strawberries.

• Scientists have created 32-ploid strawberries, which are larger than the commercial octoploid strawberries.

What is polyploidy?

• A type of plant disease

• A natural phenomenon involving chromosome number in cells

• A method of plant breeding

• A monster from folklore

How many sets of chromosomes do humans have?

• One set

• Two sets

• Three sets

• Four sets

What percentage of plants on Earth are polyploid?

• 10%

• 25%

• 30%

• 50%