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docker41 [41]
3 years ago
12

The allele for tay-sachs is a recessive allele that causes death in early childhood. The tay-sachs' prgram has enabled Tim McGra

w to determine that he is a carrier and that his wife is not. What are the chances they could have a child with Tay-Sachs?
Biology
2 answers:
Snezhnost [94]3 years ago
5 0

Answer:

There are no chances for this couple to have a child with Tay-Sachs disease. 0% of the possibilities.

Explanation:

Tay-Sachs disease affects the nervous system and is potentially mortal. It is transmitted from parents to progeny. Tay-Sachs is caused by a defective gene in the 15 chromosome.

The child that recesives two coppies of this defective gene, one from the mother and one from the father, results sick. <u>But if only one of the parents transmits the gene, then the child will be a carrier.</u> This child won't be sick but will transmit the gene to his/her own progeny.  

<u>Available data</u>:

  • The allele for tay-sachs is a recessive allele, "t"
  • Tim McGraw to determine is a carrier, Tt
  • Tim´s wife is not a carrier, TT

<u>Cross:</u>

Parental) TT     x     Tt

Gametes) T   T      T   t

Punnet square)   T         T

                     T   TT     TT

                      t    Tt      Tt

F1) Progeny genotype: 2/4= 1/2 normal, TT

                                      2/4= 1/2 Carrier, Tt

                                       0/4= 0 Sick, tt

What are the chances they could have a child with Tay-Sachs?

There are 0% of the possibilities that this family will get a sick child.

hodyreva [135]3 years ago
5 0

Answer:

The chances they would have a child with Tay-sach's is zero

Explanation:

Since Tim McGraw is a carrier; possessing just one copy of the recessive allele and the normal copy being dominant and his wife is neither a carrier nor a tay-sach's, there is zero percent chance of producing a child with Tay-sach's. This is because the condition is expressed when an individual has two copies of the recessive allele.

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