Gametes

Genetics as it applies to evolution, molecular biology, and medical aspects.

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za105
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Gametes

Post by za105 » Tue Jun 07, 2005 12:13 am

I have a question regarding gametes that I have been unable to answer. The question is:
Hypothetically speaking, what if a woman with a diploid egg mated with a man with haploid sperm?

For this I must create a Punnett square, and that is where my problem lies; how do I draw this kind of Punnett square? Are the alleles going to be all capitalized; how would I draw a Punnett square between just typical haploid gametes; and then how would the alleles of a diploid egg look different than a haploid egg?

Insidious - IA

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Poison
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Post by Poison » Tue Jun 07, 2005 6:28 pm

I didn't understand why you need a purnet square. If you really need one, you will be crossing XX and X or Y. The zygote will be 3n.
If I'm not mistaken: 66+XXX or 66+XXY.
By the way, as you said before, this is impossible. :)
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Post by za105 » Wed Jun 08, 2005 12:31 am

Are there not 23 chromosomes? If so, 3n = 69. This would be the number of chromosomes a child of that couple would have, wouldn't it?

But my question remains: What would the Punnett square look like? Is this correct:
......X.....Y
X .XX . XY
X .XX . XY
X .XX . XY
X .XX . XY

In other words, are these indeed the possible genotypes of the offspring?

Thanks,
Insidious - IA

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Poison
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Post by Poison » Wed Jun 08, 2005 5:37 pm

I already answered your question. Those X s and Y , which seemed nonsense to you, are sex chromosomes. means that: 69= 66+XXX or 66+XXY
Also these are the possible genotypes about sex: XXX , XXY . Thats all.

Purnet square seemed nonsense to me because it will look like that:

..........X.........Y
XX....XXX....XXY

Let me explain it to you. You have only 1 chance from the female and it is XX. And you can have either a X or a Y from the male. so you are crossing XX with X and Y.

Hope this helped. :)
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mith
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Post by mith » Wed Jun 08, 2005 7:58 pm

Note that you said they didn't separate....therefore you should not be separating them in your crosses.....also notice that it's not a punnet square(in your example), it's a punnet rectangle!!!
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Post by MrMistery » Wed Jun 08, 2005 8:36 pm

Actually, although triploid organisms generally die as embrios, some have survived. I saw a picture in a genetics book of mine with one that lived for 45 days. It had visible malformations.
The question has been answered.

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Post by za105 » Thu Jun 09, 2005 12:14 am

Ah, I see now how that would be XXX and XXY. I didn't notice that you were combining the sex chromosomes with the others to create a total of 69. Fantastic.

Thank you guys for your responses. Hopefully I'll do well on my biology project.
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Post by Poison » Thu Jun 09, 2005 6:27 pm

MrMistery wrote:PS: topic moved to genetics board

I still see it in the human bio board. :)
@mithril:
you are right about the term 'punnet rectangle'. :lol:

@za105:
You're welcome. :)
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Re: Gametes

Post by asusor » Sat Jun 11, 2005 3:22 pm

zygote do not replicate or will soon die

za105 wrote:I have a question regarding gametes that I have been unable to answer. The question is:
Hypothetically speaking, what if a woman with a diploid egg mated with a man with haploid sperm?

For this I must create a Punnett square, and that is where my problem lies; how do I draw this kind of Punnett square? Are the alleles going to be all capitalized; how would I draw a Punnett square between just typical haploid gametes; and then how would the alleles of a diploid egg look different than a haploid egg?

Insidious - IA

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Poison
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Re: Gametes

Post by Poison » Sat Jun 11, 2005 6:45 pm

asusor wrote:zygote do not replicate or will soon die

We also know that. But we are talking about a hypothetic situation. Please read the question carefully, before answering it.
Regards...
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Post by Rayes88 » Tue Jun 13, 2006 6:34 am

Can i add onto this question?? coz I am kinda Lost..

Umm.. okay if hypothetically the child has more the normal cells. what are the factors that are important in cell size determination, and why this is so and what are some benefits and disadvantages might that person have because of the larger cell size.

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Post by oana_t » Tue Jun 13, 2006 6:30 pm

the result will be a triploid egg

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