biology help: A genetics question… I’m studying basic biology for - Help.com

PluckyDog
offline Verified (2 years, 4 months) Visit PluckyDog's shoutbox
Calgary, AB, CA

A genetics question…

I’m studying basic biology for zookeepers so there isn’t a lot of info in my text about genetics (yet, that doesn’t stop them from asking questions about it!). I am so confused! I’m not asking anyone to do it for me (I would rather learn HOW to do it myself) - I just want help on how I’m suppose to figure it out. Here is the question:

– Describe the phenotype (externally visible features) you would expect to see in the offspring of a male mammal homozygous for the dominant characteristics of long hair (HH) and black colour (BB) and a female of that species homozygous for the recessive characteristics of short hair (hh) and white colour (bb).

Note: I know what homo/heterozygous is and dominant/recessive. But I am lost at how I am suppose to figure out the off spring. Would the results be something like HH or Hh and BB or Bb? So there would be long-haired black, long-haired white, short-haired black, and short-haired white? Does that sound right at all? lol

PLEASE… any help would be greatly appreciated! Thank you for taking the time to read my post.

This closed post was written 2 years, 3 months ago | V/U/S: 286, 15, 2 | Edit Post | Report Post


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Since writing this post PluckyDog may have helped people, but has not within the last 4 days. PluckyDog is a verified member, has been around for 2 years, 4 months and has 7 posts and 138 replies to their name.

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PluckyDog changed the tags on this post: they were "genetics, Hair, white, Black, question, male, spring, Figure, long hair, Homo" 2 years, 3 months ago.

Kuvri (yodaluv12) offline Verified User (3 years) Long Term User Shouts: 2 #
Kangerlussuaq, 01, GL | 2 years, 3 months ago (21 minutes after post)

the baby would be heterozygous. Hh and Bb. So long haired black. if the mammal won’t get other genetic coloration problems like spots, mixed colors, etc. (i forget what thats called.) To solve, make a grid like this: H H B B
——- ———
hl Hh Hh bl Bb Bb

hl Hh Hh bl Bb Bb
if you can see inside the grid, all the letters are heterozygous. sorry that grid was hard to explain.

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Kuvri (yodaluv12) offline Verified User (3 years) Long Term User Shouts: 2 #
Kangerlussuaq, 01, GL | 2 years, 3 months ago (22 minutes after post)

heY! all that hard work and they moved it over. okay, ignore the stuff at the bottom.

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OliveOil offline Verified User (2 years, 4 months) Long Term User Shouts: 3 #
An Undisclosed Location | 2 years, 3 months ago (22 minutes after post)

Check out the “Dihybrid Cross” Punnett square on this link (it may be helpful since you are taking into account 2 features or characteristics)…

http://library.thinkquest.org/20830/T…

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PluckyDog offline Verified User (2 years, 4 months) Long Term User Shouts: 5 #
Calgary, AB, CA | 2 years, 3 months ago (28 minutes after post)

lol ok yodaluv… thank you. I don’t understand how two homozygous can make heterozygous?

Thank you ames… will check it now.

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OliveOil offline Verified User (2 years, 4 months) Long Term User Shouts: 3 #
An Undisclosed Location | 2 years, 3 months ago (37 minutes after post)

This Punnett Square Calculator demo. also may come in handy or cut down the confusion a bit …

http://www.changbioscience.com/geneti…

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PluckyDog offline Verified User (2 years, 4 months) Long Term User Shouts: 5 #
Calgary, AB, CA | 2 years, 3 months ago (37 minutes after post)

yodaluv… what is the hl and bl?

ames… this confuses me even more… the formulas in the grid are all the different types that could/would come out if these to bred?

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PluckyDog offline Verified User (2 years, 4 months) Long Term User Shouts: 5 #
Calgary, AB, CA | 2 years, 3 months ago (39 minutes after post)

oops… if these two horses bred…

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PluckyDog offline Verified User (2 years, 4 months) Long Term User Shouts: 5 #
Calgary, AB, CA | 2 years, 3 months ago (46 minutes after post)

ames… Umm ok, I went to your last link and this is what came out of it: all the results were the same - HhBb. So the baby would be like the father because if it were like the mother, it would have to be hh or bb (because it’s recessive)? Which is also the answer that yodaluv came up with. Am I thinking about this right?

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PluckyDog offline Verified User (2 years, 4 months) Long Term User Shouts: 5 #
Calgary, AB, CA | 2 years, 3 months ago (57 minutes after post)

Hmm… soooo if it is HH BB, I would put HB at the top of each column. And, if it’s hh bb, I would but hb at the beginning of each row going across (And if it were Hh Bb, I would put HB Hb hB hb at the beginning instead and so on)? I think I understand it now but I’m not sure. Please let me know if you think I’ve got it (not the answer but the method). Thank you.

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OliveOil offline Verified User (2 years, 4 months) Long Term User Shouts: 3 #
An Undisclosed Location | 2 years, 3 months ago (1 hour, 3 minutes after post)

Yes …you have it right!

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PluckyDog offline Verified User (2 years, 4 months) Long Term User Shouts: 5 #
Calgary, AB, CA | 2 years, 3 months ago (1 hour, 4 minutes after post)

Ooooo thank you so much! I think I’ve got it now! I don’t know why they couldn’t explain it that way in my text! XXOO to you!

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OliveOil offline Verified User (2 years, 4 months) Long Term User Shouts: 3 #
An Undisclosed Location | 2 years, 3 months ago (1 hour, 5 minutes after post)

Yay! :)

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PluckyDog offline Verified User (2 years, 4 months) Long Term User Shouts: 5 #
Calgary, AB, CA | 2 years, 3 months ago (1 hour, 6 minutes after post)

LOL… thank you again… I’ll close this post now.

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PluckyDog closed this post.

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