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3 years ago

A contraceptive that permanently prevents transport of the sperm or egg to the site of conception is a

Biology

1 answer:

scZoUnD [109]3 years ago

4 0

The answer is Surgical Contraceptive Methods e.g. Vasectomy(For males) and Tubectomy(Females).

Vasectomy:- In this method vas deference is cutted and tied so that sperms can't reach uthera.

Tubectomy:- In this method both fallopian tubes are cut and tied, so that no egg can head towards the site of reproduction(Cervix).

Note:- Both process are irreversible.

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Which part of the chloroplast is responsible for absorbing light energy from the sun

Fantom [35]

The absorption of light energy and its conversion into chemical energy occurs in multiprotein complexes, called photosystems, located in the thylakoid membrane.

5 0

3 years ago

Phenylketonuria (PKU) is a disease caused by a recessive mutation. PKU is extremely common in Ireland, affecting approximately 1

aleksklad [387]

Answer:

97%

Explanation:

PKU is caused by a recessive mutation, which means that affected individuals are homozygous and recessive (tt).

The frequency of genotypes according to Hardy-Weinberg equilibrium is:

$TT= p^2\\Tt=2pq\\tt=q^2$

where p is the frequency of the T allele and q is the frequency of the t allele.

Affected individuals are 1 in 4500, which means the frequency of tt genotype is 1/4500.

If the population is in Hardy-Weinberg equilibrium,

$q^2=1/4500\\q=\sqrt{1/4500} \\\\q=0.015$

The sum of the allele frequencies adds up to 1, therefore:

p + q = 1

p= 1 - q

p= 1 - 0.015

p= 0.985

The frequency of the TT genotype (homozygous wild-type individuals) will be:

$p^2=0.985^2\\p^2=0.97$

97% of the population will have the homozygous wild-type TT genotype.

3 0

3 years ago

An examination of a marine sea star that had died after it was mistakenly placed in fresh water would likely show that it died b

Galina-37 [17]

An examination of a marine sea star that had died after it was mistakenly placed in freshwater would likely show that it died because it was so hypertonic to the freshwater that it could not osmoregulate

Hope that helps!

7 0

3 years ago

Which of the following statements is true? Cloning creates genetically identical offspring. Recombinant DNA injects genes from b

Citrus2011 [14]

Cloning creates genetically identical offspring would be true.

3 0

3 years ago

Which of the following is not required for osmosis to occur?

Damm [24]

Answer:

Cellular energy

Explanation:

Osmosis is the movement of water from a less concentrated to more concentrated solution across a semi-permeable membrane. Cellular energy is not required in osmosis because it is a passive process. Osmosis is technically more or less the selective diffusion of water molecules across a membrane that selectively locks out other larger molecule like ions. Water will, therefore, move from the solution where there are more water molecules to the solution with fewer water molecules.

8 0

3 years ago