2 Answers

If the dogs are offspring of a monohybrid cross…

Posted by: 1308 views
BIOLOGY

If the dogs are offspring of a monohybrid cross

Use the diagram above to answer this question:

If the dogs are offspring of a monohybrid cross, and the gene G for grey head is dominant over its allele g, the individual whose genotype is likely to be gg is

A. I

B. IV

C. III

D. II

QUICK ANSWER…

B

DETAILS…  

To properly identify the genes, we need to understand that G stands for the dominant trait for greyness, and g-the recessive trait for grayness. Hence:

I = GG

II = Gg

III = Gg and

IV = gg

Now for the right answer to the above question:

  1. Option A is incorrect. I is GG, the double dominant traits for greyness yields strongly grey dog.
  2. Option B is correct. IV is gg, the double recessive traits for greyness combine to yield weakly grey dog.
  3. C is incorrect; III is Gg, the dominant and recessive traits combine to yield averagely grey dog.
  4. D is not the correct answer. II is Gg, the dominant and recessive traits combine to yield averagely grey dog.

QUICK TIPS…

You may please note that:

  • Dominant traits are the dominating traits that often mask a weaker recessive trait when present in a gene. They always find a way to express themselves phenotypically in the offspring.

You are free to add your own answers below this page to assist others improve their learning.

You can also click the golden ASK A QUESTION BOTTON down this page to raise new related questions… OUR COMMUNITY OF EXPERTS WILL BE MORE THAN HAPPY TO TACKLE IT…

/ culled from 2015 JAMB-UTME biology past question 47 /

Answer Question