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bekas [8.4K]
3 years ago
14

A section of DNA is shown below:

Biology
1 answer:
Alenkinab [10]3 years ago
3 0
Answer c sieuejejejejje
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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.

6 0
3 years ago
What are two functions of the cell membrane?
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D Good luck on the quiz!

5 0
3 years ago
How do volcanoes function as a disruptive force
jek_recluse [69]
Answer: Explosion
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6 0
3 years ago
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¿que necesita una teoría para que sea valida?
AURORKA [14]

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la teoría debe ser la precisión de las predicciones que debe producir

8 0
3 years ago
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What weight of Tris-HCL (MW=121) is required to prepare 2L of a 15% w/v solution?
podryga [215]

Explanation:

Percentage w/v means that weight of solute present in 100 ml of a solution. Hence, 15% w/v means that 15 gram of solute per 100 ml of solution.

Hence, for 2 L (or 2000 mL) preparation the amount of mass will be calculated as follows.

                 \frac{15 g}{100 ml} \times 2000 ml

                  = 300 g

Thus, we can conclude that weight of Tris-HCL required is 300 g.

7 0
3 years ago
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