Papillary muscles are structural components of the ventricles.
They are attached to the cusps of the mitral and tricuspid valves through connective tissue strings known as the cordinae tendeneae (heart strings).
These muscles prevent the prolaspse of these valves during ventricular systole.
Although they differ in number i.e. two in left and three in right ventricle, papillary muscles are present in both ventricles.

6 0

3 years ago

Zigmanuir [339]

Answer:

For the first experiment, the recombination frequency is shown below. This experiment comprises the cross between the Tall and the Antennae.

Tall-antennae - 46% - Expected

Dwarf-no antennae - 42% - Expected

Dwarf-antennae - 7% - Recombinant

Tall-no antennae - 5% - Recombinant

Total = 100%

For the recombinants, the recombination frequency is:

= 7 + 5 = 12%

Thus, the recombination frequency between the T and A genes is 12%.

For the second experiment, the cross takes place between the heterozygous antennae and the upturned snout. The results are shown below:

Antennae-upturned snout - 47% - Expected

No antennae-downward snout - 48 % - Expected

Antennae-downward snout - 2% - Recombinant

No antennae-upturned snout - 3% - Recombinant

Total = 100%

The recombinant frequency is = 2 + 3 = 5%

Thus, the recombination frequency between the A and S genes is 5%.

4 0

3 years ago