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morpeh [17]
3 years ago
14

The simplest animals that are bilaterally symmetrical and triploblastic (composed of three fundamental layers) are the Platyhelm

inthes, which are the flatworms. true or false?
Biology
1 answer:
DaniilM [7]3 years ago
3 0
This statement is false. The simplest animals that are bilaterally symmetrical and triploblastic (composed of three fundamental layers) are the Platyhelminthes, however, it is not the flatworms, instead, it is the roundworms who are the simplest animals that are bilaterally symmetrical and triploblastic.
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Glucose-6-phosphate dehydrogenase deficiency (G6PD) is an X-linked recessive disorder and the woman's father was diseased so it means that woman is a carrier of the allele but has normal phenotype. It means that she will have XXᵇ genotype.

In contrast to this, her husband is diseased so his genotype will be XᵇY.

The Punnett square diagram related to the cross is attached.

(a) Proportion of their sons expected to be G6PD is 1/2:

They both may give birth to 4 progeny with genotypes XXᵇ, XᵇXᵇ, XY and XᵇY. It means they both may have 2 sons out of which one with genotype XᵇY will be diseased while the one with genotype XY will be healthy. So the proportion of their sons having G6PD is 1/2 or 50%.

(b) If the husband were G6PD deficient, the answer will not change.

The reason behind this is that this disease is caused by an allele located in X chromosome. But father contributes only Y chromosome to his son not X chromosome. The X chromosome will affect the genotype of his daughter not son that is why answer will not change. It means they will still have 1/2 of their sons diseased.  

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Living organisms make use of resources in the environment and these can either leave negative or positive effect on the environment that will affect sustainability.

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