PLEASE HELP!!!!

Biology

1 answer:

Mademuasel [1]3 years ago

7 0

Answer:

It is important because plants respond to light depend, logically enough, on the plant's ability to sense light. Phototropism is a directional response that allows plants to grow towards, or in some cases away from, a source of light. Photoperiodism is the regulation of physiology or development in response to day length.

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Drosophila eye color is an X-linked trait. Red eye color is dominant, and white eye color is recessive. Which Punnett square sho

boyakko [2]

Answer:

The correct answer is A (XRXr, XRXr, XRY, XRY) becouse

R- is about red color

r- is about white color

if we have Rr ( XRXr)- that will be red color

white color is only when is only "r" (XrY) or only "rr" ( XrXr)

Explanation:i put this in the wrong place and im sorry

3 0

3 years ago

Complete the sentence about the continental drift theory

sergeinik [125]

The correct answers are:

1. C. Western Africa;

2. B. Eastern South America;

Alfred Wegener has spent lot of times looking at maps, as it was his job. One day he noticed something peculiar, the western coast of Africa and the eastern coast of South America were an almost perfect match. They looked like peaces of puzzle that belong together. In his mind this was suggesting that these two continents had been merged in the past, and than broke apart. He later got proof about his theory by observing the sea mounts in the Atlantic Ocean.

3 0

4 years ago

Read 2 more answers

Red-green color blindness is a human x-linked recessive disorder. the normal allele, xb, is dominant to the mutant allele, xb. j

bazaltina [42]

Very interesting problem!

On first reading, it sounded impossible. Tom has normal vision, and there are no male carriers for x-linked recessive disorders. So the daughter can at best (or worst) be carrier of the disorder.

We are told that the daughter has the disorder, but the daughter can only be a carrier with genotype XBXb.

We are also told that Turner Syndrome, which is a disorder related to the x-chromosome. Half of those affected have one of the x-chromosomes missing (monosomy), and some others have some cells with missing or deformed x-chromosomes (mosaicism). Under these circumstances where the normal chromosome is missing, the X-linked recessive Xb allele will be expressed, hence even a carrier can express the red-green colour-blindness.

From the pedigree chart, we can deduce that the colour-blindness must be inherited from Jill, the mother. Tom with normal vision cannot be a carrier because X-linked recessive disorders do not have male carriers.

The daughter's colour-blindness is derived from two sources,
1. inherited Xb allele from mother Jill
2. Turner syndrome that allowed the single allele to express colour-blindness.