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3 years ago

Allopatric speciation is another name for.. speciation by geographic isolation. speciation due to genetic mutation

Biology

1 answer:

nikdorinn [45]3 years ago

3 0

Explanation:

<u> speciation by geographic isolation</u>

Spontaneous changes within the genome may arise during the process of cell division, called mutations. These are errors when copies of the DNA are made within the cell; mutations can range from small changes called single nucleotide polymorphisms to large-scale deletions and multi-gene additions.

These mutations form variants which, within a population, become stable, resulting in the formation of separate, genetically distinct populations called species. New species emerge through several volutionary mechanisms such as allopatric speciation -physical barriers to gene flow; separation of groups that develop independently in their environments by acquiring suitable characteristics

Learn more about mutations at brainly.com/question/4602376

Learn more about DNA and RNA at brainly.com/question/2416343?source=aid8411316

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3 years ago

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Barred feather pattern is a Z-linked dominant trait in chickens. What offspring would you expect from (a) the cross of a barred

Bezzdna [24]

Answer:

Let the "barred" allele be caller B and the "non-white" allele b. Since chickens use chromosomes $Z$ and $W$ to determine sex, hens would have chromosomes $ZW$ , and roosters would have chromosomes $ZZ$ . A Z-linked gene is represented as a superscript on the $Z$ chromosome, $Z^{B}$ for the dominant allele and $Z^{b}$ for the ressesive allele.

A barred hen would have a copy of B on its Z chromosome, a non-barred rooster would have both copies of b on both Z chromosomes. Using Punnet squares to represent the crosses we get the following cases:

$\begin{center}\begin{tabular}{ |c|c|c|c| }\ & Z^{B} & W \\ \ Z^{b} & Z^{B}Z^{b} & Z^{b}W \\ \ Z^{b} & Z^{B}Z^{b} & Z^{b}W \\ \end{tabular}\end{center}$

That is a ratio of two barred heterozygote roosters to two non-barred hens. Crossing them we get:

$\begin{center}\begin{tabular}{ |c|c|c|c| }\ & Z^{b} & W \\ \ Z^{B} & Z^{B}Z^{b} & Z^{B}W \\ \ Z^{b} & Z^{b}Z^{b} & Z^{b}W \\ \end{tabular}\end{center}$

That is a ratio of one barred heterozygote rooster to one barred hen to one non-barred rooster to one non barred hen.

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3 years ago

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AlexFokin [52]

Answer:

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Explanation:

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4 years ago