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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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rkbrookover rkbrookover
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12 years ago
is it
-No hybrids are produced.
-The recessive trait seems to disappear.
-The offspring are of medium height.
-All the offspring are short.
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wrote...
#1
12 years ago
the recessive trait seems to disappear
wrote...
#2
12 years ago
B) The recessive trait seems to disappear.

This is because four dominant alleles appear over the four recessive alleles.

Let's break this down:  Homozygous means having one allele set.  So we know that the plants are TT and tt.  We can see that each plant will have a dominant allele by using a punnett square, where we use a capital to denote a dominant allele and a lowercase to denote a recessive allele.

....T...T
t..Tt...Tt
t..Tt...Tt

Since each plant has one dominant allele, it will hide or "mask" the recessive allele.
Now I'll explain why the other answers are false.  The statement "No hybrids are produced" is false, because each plant is a "heterozygous" or "hybrid" organism.  The offspring could not be of medium height because alleles don't mix, they're expressed or not.  All the offspring are short is false because the shortness allele is recessive, and can't be expressed while a dominant allele is present.

--Yamakiri
wrote...
#3
12 years ago
You end up with all heterozygous pea plants.  Since the tall gene is dominant, the recessive trait seems to disappear.
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