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4 years ago

On which point(s) would charles darwin and georges buffon have likely disagreed

1 answer:

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The possibility that life shares a common ancestor. Charles Darwin proposed the hypothesis of an all-inclusive basic plunge through a transformative procedure in On the Origin of Species, twice expressing the theory that there was just a single begetter for all living things and closure.

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Why are tortoiseshell cats female? Why are tortoiseshell cats female?

Neko [114]

Answer:

All tortoiseshell and tortoiseshell and white (Calico) cats are female. But not all gingers are male, though most are. The reason is that in cats the colour gene is carried on the X chromosome. As females have two Xs they can express two colours in the coat, and if black is inherited from one parent and ginger (red) from the other, the result is a calico cat. The calico's brother, having only one X chromosome, would be either ginger or black, depending on the colour of the mother. I believe there was a case of an apparently male calico cat but it was found to have a mutation giving an XXY chromosome set-up, and was sterile. For a female to be ginger she would have to inherit red from both parents. This could happen if the father was ginger and the mother tortoiseshell for example. The white is inherited on a separate gene and is independent of the colour gene. It can appear on either gender and with any colour of coat. For some reason not understood it is usually found that in tortoiseshell and white cats the patches of black and ginger are larger and more distinct than in the plain tortoiseshell without white. A tabby pattern of stripes can also be inherited separately, resulting in a cat known as a "torby" (Tabby-tortoiseshell).

Explanation:

3 0

3 years ago

The order of the genes on a plant chromosome is A, B, C, where A and B are located 10 cM apart and B and C are located 3 cM apar

Nonamiya [84]

Answer:

Double Crossing-over prob = 0.3%
Simple Crossing-Over prob A-B = 9.7%
Simple Crossing-Over prob B-C = 2.7%
Total Crossing-Over prob = 12.7%

Explanation:

<u>Available data</u>:

order of the genes on a plant chromosome is A, B, C
A and B are located 10 cM apart
B and C are located 3 cM apart

The genetic distance = recombination frequency x 100 expressed in map units (MU). One centiMorgan (cM) equals one map unit (MU).

We can use the provided map with the distances between genes to predict the occurrence of any kind of recombinant gamete.

We know that there is a probability of a simple crossing over to occur between genes A and B, or between genes B and C. And we also know that there is a probability of double crossing-over occurrence.

We can get the probability of the double-crossing over by multiplying the recombination frequencies between A-B and B-C. So,

DCO prob = recombination frequency A-B x recombination frequency B-C

= 0.1 x 0.03 = 0.003 = 0.3%

DCO prob = 0.3%

According to this, we would expect to find

0.15% AbC
0.15% aBc

Now we need to know what are the probabilities of getting a simple crossing-over, SCO. We already have the genetic distances between genes. 10 cM equals 0.1 of recombination frequency, and 3cM equals 0.03 of recombination frequency. However, we can not estimate the probabilities of simple crossing over using only this information, because this data is including the probabilities of the double crossing-over occurrence. So we need to substrate this percentage.

SCO prob A-B = 0.1 - 0.003 = 0.097 = 9.7%

SCO prob A-B = 9.7%

we would expect to find

4.85% Abc
4.85% aBC

SCO prob B-C = 0.03 - 0.003 = 0.027 = 2.7%

SCO prob B-C = 2.7%

we would expect to find

1.35% ABc
1.35% abC

The total Crossing-over probability, TCO, is then the sum of all the crossing over probabilities,

TCO= SCO A-B + SCO B-C + DCO

TCO prob = 9.7% + 2.7% + 0.3%

TCO = 12.7%

8 0

3 years ago

What is the name for the protective structure that forms around an embryo

PIT_PIT [208]

The name for the protective structure that forms around an embryo is called Placenta

8 0

3 years ago

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Cyanobacteria were the first photosynthetic organisms. How were they responsible for allowing higher life forms to evolve? A. Th

Mumz [18]

I think the correct answer from the choices listed above is option C. Cyanobacteria is responsible for allowing higher life forms to evolve by releasing oxygen, which created the ozone layer, resulting in reduced mutation rate.<span />

4 0

3 years ago

Read 2 more answers

a flower pot sits on the front stoop of a house. a. cl: a b. cl: c c. cl: ily d. cl: h choose the classifier that will best desc

Sergio [31]

The answer to the above question is A. CL:A. I hope that this is the answer that you were looking for and it has helped you. Have a nice day.

3 0

4 years ago