In a particular plant three genes ( Aa, Bb, Cc ) influence height, such that eac

Question

In a particular plant three genes (Aa, Bb, Cc) influence height, such that each dominant allele adds 2 cm, to a base height of 2 cm. The recessive alleles do not add any height. The three genes are linked, as shown on the map below. For this region of the chromosome, there is no interference.

                   A                    9m.u                 B            10m.u                    C

You crossed a 14 cm tall homozygous dominant plant [ABC/ABC] with a 2 cm tall homozygous recessive plant [abc/abc] to generate F1 trihybrid plants. The trihybrid plants were then backcrossed to the 2 cm parent (this is a testcross, right?).

Part A                           

How many centimeters tall are the F1 plants?

Enter your answer as a single whole number (not word). Do not include the units (no "cm")

Part B

What percentage of the testcross progeny will be 2 cm tall?

Enter the number, including 2 decimal places. Include the % symbol where indicated.

Part C

What percentage of the testcross progeny will be 4 cm tall?

Enter the number, including 2 decimal places. Include the % symbol where indicated.

Part D

What percentage of the testcross progeny will be 6 cm tall?

Enter the number, including 2 decimal places. Include the % symbol where indicated.

Part E

What percentage of the testcross progeny will be 8 cm tall?

Enter the number, including 2 decimal places. Include the % symbol where indicated.

Part F

If A1 is a new antimorphic allele, would the height of the A1aBBCc trihybrid plant be taller, shorter or the same height as the AaBbCc trihybrid plant?

If A1 is a new antimorphic allele, would the height of the A1aBBCc trihybrid plant be taller, shorter or the same height as the AaBbCc trihybrid plant?

taller

shorter

the same

Explanation / Answer

Based on the given data, the given genetic cross is a Test cross:

Part-A:

The F1 plants have 14 centimeters length. Hence, the answer is 14.

Part-B:

The percentage of the testcross progeny will be 2 cm tall is: 25%.

Part-C:

The percentage of the testcross progeny will be 4 cm tall is: 25%.

Part-D:

The percentage of the testcross progeny will be 6 cm tall is: 25%.

Part-E:

The percentage of the testcross progeny will be 8 cm tall is: 25%.

Part-F:

If A1 is a new antimorphic allele, would the height of the A1aBBCc trihybrid plant be taller.

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