An opening between the right and left atria that's present in fetal mammals is the

1 answer:

7 0

It is the Foramen Ovale. The foramen ovale is a little gap situated in the septum between the two upper councils of the heart. The foramen ovale is utilized amid fetal dissemination to accelerate the go of blood through the heart.
The one fatal cardiac shunts, the other being the ductus arteriosus. Another comparative adjustment in the embryo is the ductus venous. In many people, the foramen ovale closes during childbirth.

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HELP ASAP<br> Punnett Squares

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Answer: The genotype ratio of offsprings of a cross between one homozygous tall plant and one heterozygous tall plant is 2TT:2Tt

The phenotype ratio is that all offsprings will be tall.

The genotype ratio of a cross between two heterozygous red flowers is 1RR:2Rr:2rr. The phenotype ratio is 3 Red flowers: 1 white flower.

Explanation: From the information given, tall is dominant and short is recessive while red is dominant and white is recessive.

Let T represent the allele for tall height, t represent the allele for short height, R represent allele for red flowers and r represent allele for white flowers.

The genotype of a homozygous tall plant is TT, the genotype of a heterozygous tall plant is Tt, the genotype of a heterozygous red flowered plant is Rr.

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Tt will manifest outwardly as tall because T is dominant over t. Therefore, all the offsprings will be tall.

The possible genotypes of a cross between two heterozygous red flowers are RR, Rr and rr. RR will manifest as red, Rr will also manifest as red because R is dominant to r while rr will manifest as white because white allele (r) is recessive. Therefore 3 plants will be red-flowered while 1 plant will be white flowered.

See the attached punnet squares for details of the cross.

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