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Andreyy89
3 years ago
12

Why is XcY color blind, but XcXC not color blind? Can an XcXC female pass the color blind trait to her children?

Biology
1 answer:
Nesterboy [21]3 years ago
3 0


Somebody needs at least one XC to not be colorblind. XcY doesn't have XC, so they are colorblind. XcXC has XC, so they are not colorblind. (a colorblind female would need both to be colorblind - XcXc)

And XcXC female can pass colorblindless onto her children. For example, even if the father was a normal male (XCY), the one possible child could be XcY (with Xc from the mother and Y from the father), which doesn't have XC so its colorblind.

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strojnjashka [21]
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6 0
3 years ago
The lactose (lac) operon in E. coli is an example of a repressed gene when lactose is not available in a cell. In 3-5 sentences
irakobra [83]

Answer:

Please find the detailed explanation of this statement below

Explanation:

Firstly, a repressed gene is a gene whose expression has been inhibited or repressed. The lac operon in E.coli bacteria is a regulatory unit containing structural genes, a single promoter and operator regions. The promoter is the region where the transcription enzyme (RNA polymerase) binds to in order to transcribe the genes in the lac operon. The structural genes in the lac operon can only be expressed in the presence of lactose sugar.

However, in the absence of lactose, LAC REPRESSOR, which is a transcription factor (protein), prevents the binding of RNA polymerase to the PROMOTER region by binding to the OPERATOR region of the lac operon. This inhibits the expression of the lactose genes in the operon.

Note that, the structural genes in the lac operon (lacZ, lacY, lacA) code for proteins that help break down lactose sugar for energy in the E.coli bacteria. Therefore, a bacteria cell with a repressed lac operon will be unable to degrade lactose sugar.

4 0
3 years ago
his nutrient is cycled between living things and the soil. Plants absorb this nutrient from the soil and turn it into organic co
djverab [1.8K]

The nutrient is phosphorus

<h3>The phosphorus cycle</h3>

Phosphorus cycles between living components of the earth (biosphere) and the soil (geosphere).

The element's reservoir is mainly the sediments of the ocean and rocks. Phosphorus gets into the soil by weathering of rocks.

Plants are able to pick the element up from the soil and animals are able to get their phosphorus by consuming plants.

When plants and animal die, their body decomposes and the phosphorus in them enters the soil.

Thus, the cycle being referred to in the illustration is the phosphorus cycle.

More on phosphorus cycle can be found here: brainly.com/question/15020567

#SPJ1

3 0
2 years ago
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AnnZ [28]

Answer:

In space

Explanation:

Because it would be weird if it would be in earth's atmosphere, and hitting the sun is rare. Most likely to come from space

8 0
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