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marshall27 [118]
3 years ago
6

Marfan syndrome is a dominant trait. A cross between a homozygous dominant and a heterozygote would produce what phenotypic rati

o
Biology
1 answer:
umka2103 [35]3 years ago
3 0

Answer:

The correct answer is- 4:0

Explanation:

Marfan syndrome is a genetic problem which affects the connective tissue in the body. The trait for this disease is autosomal dominant which means even one abnormal copy of this gene in the offspring or individual is sufficient to cause this syndrome.

Let S is the allele that is dominant for this syndrome and s is recessive. So if a cross between homozygous dominant(SS) and heterozygous individual (Ss) occurs than all the offspring would have this syndrome.  

                                   S      s

                              S  SS   Ss

                              S  SS   Ss

Therefore all 4 offspring would have at least one dominant allele which is sufficient to cause this syndrome. So the phenotype ratio would be 4:0.

                       

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What is true about Carbon facts
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Answer:

Carbon usually has a valence of +4,

Explanation:

6 0
3 years ago
A spring was at its resting position where it is attached to a wall at its left side and a block at its right side as shown belo
gladu [14]

Answer:

The force of spring will be "3.75 N". The further explanation is given below.

Explanation:

The given values are:

Spring constant, K = 75.0 N/m

x₁ = 0.200 m

x₂ = 0.150 m

So that,

⇒ x=x_{1}-x_{2}

⇒    =0.200-0.15

⇒    =0.05 \ m

Now,

Force of spring will be:

⇒  F=K\times x

On putting the estimated values, we get

⇒      =75\times 0.05

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3 0
3 years ago
When a nerve impulse travels from neuron 1 to neuron 2, neuron 1 is known as the _____. ​gated channel ​presynaptic neuron ​post
lord [1]

Answer;

-Presynaptic neuron

Explanation;

-When a nerve impulse travels from neuron 1 to neuron 2, neuron 1 is known as the presynaptic neuron.

-This is a neuron from the axon terminal of which an electrical impulse is transmitted across a synaptic cleft to the cell body or one or more dendrites of a postsynaptic neuron by the release of a chemical neurotransmitter.

- A postsynaptic neuron is a neuron to the cell body or dendrite of which an electrical impulse is transmitted across a synaptic cleft by the release of a neurotransmitter from the axon terminal of a presynaptic neuron.

6 0
3 years ago
Predict what would happen to typical animal cells placed in 0.0M and 1.0M sucrose solutions, and explain your prediction. The an
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Answer:

The animal cell will take in water until it eventually swells or burst

Explanation:

Osmosis is an important phenomenon that drives the movement of water across membranes. It is defined as the movement of water molecules from a region of high water concentration/low solute concentration to a region of low water concentration/high solute concentration across a semi-permeable membrane.

In this case, the animal cell with a molar concentration of 2.0M is placed in 0.0M and 1.0M sucrose solutions. This means that the cell is placed in an hypotonic solution (solution with low solute concentration), hence, water will move from the extracellular solution into the animal cell since the solute concentration in the cell is more. The animal cell will begin to swell and eventually burst.

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3 years ago
"Assume that a man and a woman are phenotypically normal, but the woman is heterozygous for a pericentric inversion on chromosom
Ahat [919]

Answer:

Explanation:

Pericentric inversion results in chromosome have extra copies of some genes while some genes do not have copies. It can result in slow growth rate.

If a man is heterozygous of pericentric and a woman is heterozygous of pericentric although they do not show symptoms there is 25% chance that their offspring will have it and 50% chance of them being a carrier.

T t × T t will give TT T t T t t t

If the father is not heterozygous of it but the mother is heterozygous they have 0% chance of having it and 50% chance of being heterozygous a carrier of the disorder

T t × TT will give TT TT T t T t

3 0
3 years ago
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