Urgent Bio Question

[jagibbs07]

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Hey guys I need y'alls opinion on something. Its a multiple choice question (just one!!)

If a recessive allele causes a fatal disease that kills the affected individual before he or she can reproduce, why doesn’t that allele quickly become extinct in the population?

A) The homozygous dominant individuals protect the recessive allele in their genomes.
B) The recessive allele is carried in the genome of heterozygotes, who do not suffer from the disease.
C) Alleles are never lost from a population.
D) Two of the above answers are correct

I chose B, but some people thought it was D because they thought A made sense.
What do you all think?

 

[Hemorrage]

Hey guys I need y'alls opinion on something. Its a multiple choice question (just one!!)

If a recessive allele causes a fatal disease that kills the affected individual before he or she can reproduce, why doesn’t that allele quickly become extinct in the population?

A) The homozygous dominant individuals protect the recessive allele in their genomes.
B) The recessive allele is carried in the genome of heterozygotes, who do not suffer from the disease.
C) Alleles are never lost from a population.
D) Two of the above answers are correct

I chose B, but some people thought it was D because they thought A made sense.
What do you all think?

i believe it would be D. The allele that causes lethal recessive embryonic death occurs when heterozygotes mate, however since one of their chromosomes are carrying the allele it is still in the population

 

[jagibbs07]

don't you mean B then?

 

[CarlATHF]

Hey guys I need y'alls opinion on something. Its a multiple choice question (just one!!)

If a recessive allele causes a fatal disease that kills the affected individual before he or she can reproduce, why doesn’t that allele quickly become extinct in the population?

Assuming that you are only talking about a single autosomal gene with a dominant and recessive allele that can be inherited/expressed:

A) The homozygous dominant individuals protect the recessive allele in their genomes.
A is incorrect because, by definition, homozygous dominant has two copies of the dominant allele with zero copies of the recessive allele. This makes D incorrect.
B) The recessive allele is carried in the genome of heterozygotes, who do not suffer from the disease.
B is correct.
C) Alleles are never lost from a population.
C is incorrect, alleles get lost all the time.
D) Two of the above answers are correct

I chose B, but some people thought it was D because they thought A made sense.
What do you all think?

Source: I was a Bio major in college.

See above.

 

[jagibbs07]

seeing you're med student i trust you. thank a bunch bro

 

[1TB4RKSB4CK]

SDN... umm.. Isn't for HW....
Yeah...

 

[sector9]

SDN is not for homework help. Closed.