Two highly inbred tobacco plants are crossed. one has dark green leaves. the other has yellow leaves. the f1 have light green leaves. five hundred progeny from f1 × f1 crosses are analyzed. their leaves show continuous variation in color, but none has dark green or yellow leaves. what do these data suggest about the number of genes determining this trait?
a) there are two genes that determine this trait.
b) there are more than four genes that determine this trait.
c) there are three genes that determine this trait.
d) there are four genes that determine this trait.
e) there is not enough information to estimate the number of genes.

Option B - There are more than four genes that determine this trait.

Explanation:

The tobacco plant species have its leaf colour with characteristics that changes gradually over a range of values, which refers to continuous variation.

Note that continuous variation keep expressing gene variants in successive generations of the tobacco plants, that differs from the parents. So, there are MORE THAN four genes controling the expression of varying phenotypes in the leaves

1: the largest region of the brain is the:

  cerebrum

2. the term "psychology" literally means:

the process or procedure of the science or study of the mind.

3. the area of the brain responsible for respiration, heart rate, and smooth muscle control of our blood vessels is t

medulla oblongata

4. the structure that conducts nerve impulses to and from the brain and serves as a reflex center for some sensory information without input from the brain is the:

spinal cord

5. the three-layered membrane that covers the brain and spinal cord and literally means membrane is called the:

meninges

6. the cord-like (string-like) structures that carry bio-electrical impulses from one part of the body to another are called

nerves

7. a group of nerve cell bodies that are found outside of the spinal cord and brain are referred to as:

ganglions or ganglia (pl.) “literal meaning knot”

8. the term that means spinal cord inflammation is:

myel/itis

answer; ///i believe the answer your looking for is (ribosomes);