Genetics Q (need help fast! 12 hrs until the DAT)

[studlyguy87]

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Homologus chromosomes are:

A. the chromosomes contributed by each sexual partner,
B. the chrosomes in a pair, which are, genetically, alike in shape, size and gene arrangement.

The correct answer is (B), but I think A is also a valid answer, because for any given homologous chromosome, one is from a male and the other from a female.

Can anyone explain to me why (a) isnt the correct answer?

 

[tamkhan]

key word is pair, listed only in choice B.

the first choice doesn't take into account the fact that homologous chromosomes are always in pairs.

 

[rose786]

With 12 hrs to go, you should be focused on getting a good night's sleep and a good meal. If you must study, try something easy to boost up your confidence. No need to get your nerves rattled.

 

[CannonD]

my friend,
the Not all sex chromosome are homologous,because male has XY and female has XX.

 

[jntruong2003]

just relax, i'm sure you will do fine. have a good night's rest and just pump yourself up for tomorrow.

 

[bigstix808]

Homologus chromosomes are:

A. the chromosomes contributed by each sexual partner,
B. the chrosomes in a pair, which are, genetically, alike in shape, size and gene arrangement.

The correct answer is (B), but I think A is also a valid answer, because for any given homologous chromosome, one is from a male and the other from a female.

Can anyone explain to me why (a) isnt the correct answer?

this is a bad question. there are polyploid organisms out there that have multiple (more than 2) homologous chromosomes (goldfish, salamanders, etc.)