Bio question

[hygiene101]

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I am going over bio questions from DAT Achiever and it says that sperm cell does not contain an X chromosome. Is that true? OR I am going crazy. I thought that it could be X or Y. Please help.😕

 

[dentalplan]

well..you're completely right -- sperm can either be X OR Y. Which then combine with female gametes which are only X, to make either an XX or XY zygote.

So you are right, and Achiever is either wrong, in that they have overlooked this detail, or perhaps you're reading it wrong, and maybe the question or answer is actually referring to something else.

What was the exact question?

 

[Zerconia2921]

I am going over bio questions from DAT Achiever and it says that sperm cell does not contain an X chromosome. Is that true? OR I am going crazy. I thought that it could be X or Y. Please help.😕

Sperm are haploid cells that contain either x or y chromosomes.

 

[hygiene101]

well..you're completely right -- sperm can either be X OR Y. Which then combine with female gametes which are only X, to make either an XX or XY zygote.

So you are right, and Achiever is either wrong, in that they have overlooked this detail, or perhaps you're reading it wrong, and maybe the question or answer is actually referring to something else.

What was the exact question?

Here is the exact q.
Choose the INCORRECT representations.
I. Parthenogenesis -- develops into an adult from an unfertilized egg
II. Sperm cell -- contains X and Y chromosomes
III. Crossing over -- leads to genetic variation
IV. Alternation of generations -- occurs in animal life cycles

This what they say



Correct Answer: II & IV (are incorrect)
II & IV are INCORRECT because:
Sperm cell -- does not contain X chromosome
Alternation of generations -- runs commonly in the plant life cycles

 

[dentalplan]

Here is the exact q.
Choose the INCORRECT representations.
I. Parthenogenesis -- develops into an adult from an unfertilized egg
II. Sperm cell -- contains X and Y chromosomes
III. Crossing over -- leads to genetic variation
IV. Alternation of generations -- occurs in animal life cycles

This what they say



Correct Answer: II & IV (are incorrect)
II & IV are INCORRECT because:
Sperm cell -- does not contain X chromosome
Alternation of generations -- runs commonly in the plant life cycles

ok yeah, Achiever is wrong in this case. They're usually very good with the facts, but I guess not for this question. Don't worry -- just move on. You're right.

 

[Predentknight]

Achiever is not wrong. It says...contains X and Y chromosomes which makes it incorrect. It should be X or Y chromosome. Im pretty sure we all know alternations of generations does not occur in animal life cycles. This makes II and IV incorrect.

 

[userah]

i think it's cuz it said sperm cells contain x AND y chromosomes. sperm cell contains EITHER x OR y chromosome. wording of the question is just poor. i noticed achiever always has a few questions that are just very badly worded...

 

[userah]

haha looks like predent beat me to it =P

 

[Zerconia2921]

ok yeah, Achiever is wrong in this case. They're usually very good with the facts, but I guess not for this question. Don't worry -- just move on. You're right.

There not wrong it says x and y chromosomes the AND means they come together which is not the case they come as either x OR y.

 

[dentalplan]

Here is the exact q.
Choose the INCORRECT representations.
I. Parthenogenesis -- develops into an adult from an unfertilized egg
II. Sperm cell -- contains X and Y chromosomes
III. Crossing over -- leads to genetic variation
IV. Alternation of generations -- occurs in animal life cycles

This what they say



Correct Answer: II & IV (are incorrect)
II & IV are INCORRECT because:
Sperm cell -- does not contain X chromosome
Alternation of generations -- runs commonly in the plant life cycles

I still think achiever is wrong. Just look at what they said: "Sperm cell -- does not contain X chromosome"

You're telling me that's true? It's not true - sperm cells CAN contain an X chromosome, or a Y.

However, I do give them credit for making you think. I think the point of this question is to realize that sperm cells are haploid and do not contain X AND Y chromosomes; they only contain one or the other.

So basically, achiever is 50% right, 50% wrong. The answer they give is correct. The explanation is wrong. Who cares, move on.

 

[supraman]

Whats misleading is the answer, not the question:

"Sperm cell -- does not contain X chromosome"

 

[hygiene101]

I still think achiever is wrong. Just look at what they said: "Sperm cell -- does not contain X chromosome"

You're telling me that's true? It's not true - sperm cells CAN contain an X chromosome, or a Y.

However, I do give them credit for making you think. I think the point of this question is to realize that sperm cells are haploid and do not contain X AND Y chromosomes; they only contain one or the other.

So basically, achiever is 50% right, 50% wrong. The answer they give is correct. The explanation is wrong. Who cares, move on.

You are absolutely right. The explanation is wrong.
Thanks for all your help.