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mamaluj [8]
3 years ago
13

23. Each trait has two alleles. How many alleles would have to be a dominant allele for the offspring to express a dominant trai

t
Biology
1 answer:
ExtremeBDS [4]3 years ago
3 0

Answer:

One (1) of the alleles

Explanation:

According to Gregor Mendel in his series of experiments, he discovered that two forms of a gene called ALLELE contributed to the formation of a trait. However, in his law of dominance, Mendel stated that one allele called the DOMINANT ALLELE has the ability to mask the phenotypic expression of the other allele called RECESSIVE ALLELE when present.

This means that, in a combination of both alleles in a gene (heterozygous), only one allele coding for a phenotypic characteristics will be expressed. This phenotype is called the DOMINANT TRAIT.

For example, if tall allele (T) is dominant over the short allele (t), the tall trait will be expressed when the genotype is "Tt" meaning that only one of the alleles would have to be a dominant allele for the offspring to express a dominant trait.

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B. How does weathering affect Earth's surface?
Harman [31]

Answer:

Weathering and erosion constantly change the rocky landscape of Earth. Weathering wears away exposed surfaces over time. The length of exposure often contributes to how vulnerable a rock is to weathering. Rocks, such as lavas, that are quickly buried beneath other rocks are less vulnerable to weathering and erosion than rocks that are exposed to agents such as wind and water.

Explanation:

Weathering describes the breaking down or dissolving of rocks and minerals on the surface of the Earth. Water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. Once a rock has been broken down, a process called erosion transports the bits of rock and mineral away. No rock on Earth is hard enough to resist the forces of weathering and erosion. Together, these processes carved landmarks such as the Grand Canyon, in the U.S. state of Arizona. This massive canyon is 446 kilometers (277 miles) long, as much as 29 kilometers (18 miles) wide, and 1,600 meters (1 mile) deep.

3 0
3 years ago
Which of the following is considered abiotic?
Veronika [31]

Sediment deposition and Animal waste

4 0
3 years ago
Read 2 more answers
On the Bahamian island of Andros, mosquitofish populations live in various, now-isolated, freshwater ponds that were once united
makkiz [27]

Answer:

sexual selection

natural selection

Explanation:

Natural selection is an evolutionary mechanism (changes the allele frequency) by favouring traits that are advantageous among others because they increase the survival and reproduction. In the example above, mosquitofish that live in the predator-rich ponds devoloped a trait that help them survive (swimming in short, fast bursts). This adaptation to environment is favourable by natural selection.

Sexual selection refers to the female mosquitofish and the fact that they choose their males (with better reproductive success).

8 0
3 years ago
If a healthy 6-year-old child (who does not have evidence of immunity to varicella) was exposed to a confirmed case of varicella
Valentin [98]

Administer varicella vaccine to the health 6-year old child (who does not have evidence of immunity to varicella) was exposed to a confirmed case of varicella 2 days ago.

Explanation:

It is seen that if a child receives varicella vaccine between 3 to 5 days of exposure, he is safe as disease will not appear in him and would be saved for future infections.

Varicella vaccine is given for prevention against small pox. It is expected once immunised with varicella body will produce antibodies for a span of twenty years or more.

6 0
3 years ago
As Earth spins, the part facing the sun has?
never [62]
Hi,

The answer would be day.

I hope this helps!
8 0
3 years ago
Read 2 more answers
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