In a certain type of plant, red flower color is dominant to white flower color. A purebred plant with red flowers was crossed with a purebred plant with white flowers. All the seeds from this cross were collected. One seed was randomly picked from the cross, planted, and allowed to grow under normal conditions. Assume that no mutations occurred.
Which statement explains the probability that the plant will produce red or white flowers?
Answer options with 4 options
A.
There is a 75% chance the flowers will be red and a 25% chance of white, because the red trait is dominant to the white trait.
B.
The chance of red or white flowers is impossible to predict, because the seed was chosen randomly from all the seeds produced.
C.
There is a 50% chance that the flowers will be red and a 50% chance of white, because each parent provides a gene for flower color.
D.
There is a 100% chance that the flowers will be red and a 0% chance of white, because each of the seeds received the dominant
The correct answer is C. There is a 50% chance that the flowers will be red and a 50% chance of white, because each parent provides a gene for flower color. In this case, the red flower color is dominant, but since the plant was crossed with a purebred plant with white flowers, it means that the plant also carries a gene for white flower color. Therefore, there is an equal chance for the plant to produce red or white flowers.
A bird stays close to you as you move through tall grass. The bird eats grasshoppers that fly up as you move along, but the bird does not bother you. This type of ecological relationship is an example of
Answer options with 5 options
A.
commensalism.
B.
mutualism.
C.
parasitism.
D.
predator−prey.
E.
metabiosis.
A. commensalism.
"Pioneer" and "Climax" are stages of
Answer options with 5 options
A.
germination.
B.
succession.
C.
pollination.
D.
fertilization.
E.
respiration.
B. succession.
What is cellular respiration?
Answer options with 4 options
A.
a process that produces two identical cells
B.
a process that brings oxygen into the lungs and releases carbon dioxide
C.
a process that transforms food energy into mechanical and heat energy
D.
a process that produces proteins in cells by translating genetic information
C. a process that transforms food energy into mechanical and heat energy
In guinea pigs, the allele for short fur (Uppercase S) is dominant to the recessive allele for long fur (Lowercase s).
What percentage of offspring would be homozygous dominant if both parents were heterozygous for the trait?
Answer options with 5 options
A.
0%
B.
25%
C.
50%
D.
75%
E.
100%
The correct answer is C. 50%
The correct answer is C.
To understand why, we need to understand the concept of dominant and recessive traits. In this case, red flower color is dominant, while white flower color is recessive.
When a purebred plant with red flowers is crossed with a purebred plant with white flowers, their offspring will all be hybrid (heterozygous) for flower color. This means that they have one gene for red flowers and one gene for white flowers.
When one seed is randomly selected from the cross and planted, it means that there is an equal chance of selecting a seed with a red flower gene or a white flower gene. Therefore, there is a 50% chance that the seed will have the gene for red flowers, and a 50% chance that it will have the gene for white flowers.
Since each parent provides a gene for flower color, the probability of red or white flowers is equal - 50% chance of red and 50% chance of white. Thus, option C is the correct answer.