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ruslelena [56]
2 years ago
13

DNA replication is an important part of cellular division because correct replication-

Biology
1 answer:
Tanzania [10]2 years ago
8 0

Answer:

Replicating DNA is fragile, and can break during the duplication process. In fact, broken chromosomes are often the source of DNA rearrangements and can change the genetic program of a cell. These changes can trigger a growth advantage in a single cell in your body, and when that cell continues to divide, tumors arise. Fortunately, our cells have defense mechanisms to shield us from these damaging events.

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Hairlessness in American rat terriers is recessive to the presence of hair. Suppose that you have a rat terrier with hair. Expla
Reil [10]

Answer:

By performing a test cross i.e. a cross with a recessive trait

Explanation:

According to the question, hairlessness is a recessive trait, meaning that it will only be expressed in a homozygous condition i.e. when there are two recessive alleles in the genotype. Presence of hair is dominant, meaning that it will mask the phenotypic expression of hairlessness allele in a heterozygous state. Hence, a dominant phenotype can either be homozygous (same dominant allele) or heterozygous (combination of dominant and recessive alleles).

In order to determine which of these genotypes the dominant phenotype possess, we perform a test cross. A test cross is a cross performed to determine the genotype of the dominant organism by crossing it with a homozygous recessive genotype.

Ideally, the offsprings resulting from the cross will all be phenotypically dominant if the organism in question is homozygous dominant but if the organism is heterozygous dominant, the offsprings will occur in an equal ratio of dominant to recessive phenotypes.

So in this case, all of offsprings of this cross between the rat terriers will possess hair if the dominant rat terrier dog is homozygous, but if the dominant rat terrier dog is heterozygous, an hairless offspring will be produced.

8 0
3 years ago
Which of these is an external pest
scZoUnD [109]

Answer:

C

Explanation:

Lice. External parasites are those that live on the outside of the body. A few of the most common external parasites that affect beef animals

4 0
2 years ago
Read 2 more answers
What might the colonists have harvested in 1621?
Ugo [173]
They have harvested potato's carrots, and more for it was thanksgiving.
3 0
2 years ago
Read 2 more answers
What is the difference between a homogeneous and a heterogeneous mixture? What is the difference between a homogeneous and a het
kow [346]

Answer:

Option (B).

Explanation:

Mixture may be defined as the solution obtained by mixing of two or more substances together. Two different types of mixture are homogeneous mixture and heterogeneous mixture.

Homogeneous mixture may be defined as the mixture that has uniform composition throughout the mixture and cannot be separated easily by physical shaking process. Heterogeneous mixture are the mixtures that has different composition throughout the mixture and can be separated by simple shaking.

Thus, the correct answer is option (B).

7 0
3 years ago
What do you call an organism that lives in or on another organism and feeds on that other organism
goldfiish [28.3K]
The host. have a good day!!
7 0
3 years ago
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