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3 years ago

Use the drop-down menus to select the names of the labeled structures A: B: C:

Biology

2 answers:

likoan [24]3 years ago

8 0

Answer:

A: crust

B: mantle 

C:core explanation may it help u buddy 

MaRussiya [10]3 years ago

4 0

Answer:

A: crust

B: mantle

C: mantle

Explanation:

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A couple without an ancestral history of Tay-Sachs disease (a rare autosomal recessive) have two normal children and an infant a

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Answer:

The probability is 25%.

Explanation:

Let the dominant allele for the disease be 'T' and recessive allele be 't'.

The couple with normal phenotype produces an infant with the Tay Sach's disease.
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If either of the individual (brother or sister) has TT genotype and the other has other has either TT or Tt genotype, there is zero probability that they will produce an offspring with the disease.

T T and T T

T TT TT T TT TT

(N) (N) (N) (N)

T TT TT t Tt Tt

(N) (N) (N) (N)

If both the individuals have a Tt genotype, the probability to produce diseased offspring is one-fourth or 25%.

T t

T TT Tt

(N) (N)

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(N) stands for normal and (D) stands for diseased phenotype.

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