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3 years ago

Which of the following answers matches the statament below about cellular divisions.

Biology

1 answer:

Masteriza [31]3 years ago

5 0

Answer:

C. Mitosis

Explanation:

Mitosis is a type of cell division in which a single parent cell is divided into two identical daughter cells. In mitosis, the parent cell is diploid i. e. double number of chromosomes. When replication of chromosome occurs, two identical copies of chromosome are made which is distributed to each daughter cell so the daughter cells are also diploid.

This type of cell division occurs in somatic cells or body cells which helps in the growth and repairing of the body.

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A geneticist crossed fruit flies to determine the phenotypic ratio. The geneticist crossed a fly with blistery wings and spinele

kondor19780726 [428]

Complete question:

A geneticist crossed fruit flies to determine the phenotypic ratio. The geneticist crossed a fly with blistery wings and spineless bristles (bbss) with a heterozygous fly that had normal wings and normal bristles (BbSs). Which proportion of offspring that are dominant for both traits in would you not expect based on Mendel's law of independent assortment? 1/2 , 4/16, 25% , or 1/4

Answer:

1/2 is the proportion of the offspring that is NOT expected among individuals that are dominant for both traits.

4/16 = 1/4 = 25% of the progeny and the correct expected proportion of individuals that are dominant for both traits.

Explanation:

<u>Available data</u>:

Cross: a fly with blistery wings and spineless bristles with a heterozygous fly that had normal wings and normal bristles
Recessive trait: blistery wings and spineless bristles
Dominant trait: normal wings and normal bristles

Let us say that:

B is the dominant allele for normal wings
b is the recessive allele for blistery wings
S is the dominant allele for normal bristles
s is the recessive allele for spineless bristles

Parentals) bbss x BbSs

Gametes) bs, bs, bs, bs BS, Bs, bS, bs

Punnett square) BS Bs bS bs

bs BbSs Bbss bbSs bbss

F1) 4/16 = 1/4 = 25% of the progeny is expected to be BbSs, dyhibrid individuals, expressing normal wings and normal bristles

4/16 = 1/4 = 25% of the progeny is expected to be Bbss, expressing normal wings and spineless bristles

4/16 = 1/4 = 25% of the progeny is expected to be bbSs, expressing blistery wings and normal bristles

4/16 = 1/4 = 25% of the progeny is expected to be bbss, expressing blistery wings and spineless bristles

5 0

3 years ago

Use the pie chart to answer the question below.

Mars2501 [29]

Answer:

What grade for this is it

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3 years ago

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Trisomy 21 is a genetic disorder in which an individual has an extra copy of chromosome 21?

Goryan [66]

I think it might be the third on I’m not sure completely wait on a second person

6 0

3 years ago

Question 6 of 10

Marizza181 [45]

The answer should be A.

4 0

3 years ago

Explain the respiratory system of a frog and the importance of "vacularization" of the skin and the mesentery

fredd [130]

The skin is composed of thin membranous tissue that is quite permeable to water and contains a large network of blood vessels. The thin membranous skin is allows the respiratory gases to readily diffuse directly down their gradients between the blood vessels and the surroundings. When the frog is out of the water, mucus glands in the skin keep the frog moist, which helps absorb dissolved oxygen from the air.

A frog may also breathe much like a human, by taking air in through their nostrils and down into their lungs. The mechanism of taking air into the lungs is however sligthly different than in humans. Frogs do not have ribs nor a diaphragm, which in humans helps serve in expand the chest and thereby decreasing the pressure in the lungs allowing outside air to flow in.

In order to draw air into its mouth the frog lowers the floor of its mouth, which causes the throat to expand. Then the nostrils open allowing air to enter the enlarged mouth. The nostrils then close and the air in the mouth is forced into the lungs by contraction of the floor of the mouth. To elimate the carbon dioxide in the lungs the floor of the mouth moves down, drawing the air out of the lungs and into the mouth. Finally the nostrils are opened and the floor of the mouth moved up pushing the air out of the nostrils.

Frogs also have a respiratory surface on the lining of their mouth on which gas exchange takes place readily. While at rest, this process is their predominate form of breathing, only fills the lungs occasionally. This is because the lungs, which only adults have, are poorly developed.

6 0

3 years ago