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yuradex [85]
3 years ago
15

Anna waters her plants with salty water to help them grow better. Is her thinking correct?

Biology
1 answer:
dybincka [34]3 years ago
3 0
It is true that plants need salts and minerals to grow, but access salts can lead to the plant dying. (Like how humans need some salt in there diet, but access salt is not healthy. That is why it is bad to drink sea water) Anna's way of thinking is incorrect. Salty water could lead to the plant dying because too much salt could be toxic instead of helping them grow better.
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Answer:

C. "Because you have had one child with Tay-Sachs, you must each carry the allele. Any child you have has a 25% chance of having the disease

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Tay-Sachs disease is an autosomal recessive disorder that means a child will acquire the phenotype or we can say disease only when both the alleles which cause disease are present in the child.

Here, in this condition neither parent has Tay-Sachs but they gave birth to a child who is suffering from the disease then it simply means that both the parents are carrier of this disease i.e. they both are heterozygous.

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Parents                    Tt               Tt

                              /        |          |     \

Off-springs         TT      Tt       Tt      tt

<u>Out of these 4 probable off-springs only 3 with genotype TT, Tt & Tt  will be healthy while the 1 with genotype tt will be diseased.</u><u> </u><u>So, the probability of diseased child is 1/4 which is 25%. </u>

Also, the birth of children is an independent event so if one child has already been born with this disease then it doesn't mean that the next 3 children will be healthy for sure i.e. birth of first child cannot influence the next child. In short we can also say that in the next birth, there is still 25% chance of the child being born with this disease because previous birth has nothing to do with next birth.

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