Question

1. a point mutation that occurs in a blood cell would most likely result in which of the following? a incorrect coding for a protein b more serious chromosomal mutation c a recessive trait passed on to offspring d a dominant trait passed on to offspring 7. tay - sachs disease is caused by a frameshift mutation on chromosome 15. a person with tay - sachs lacks the enzyme hexosaminidase a. this enzyme is needed to break down gangliosides, a fatty substance that is formed in nerve cells and in the brain. why does the frameshift mutation result in this disease? a the frameshift mutation creates gangliosides instead of hexosaminidase a. b the frameshift mutation creates a defect in the shape and function of nerve cells. c the frameshift mutation causes a defect in the shape of the ganglioside molecules. d the frameshift mutation causes a defect in the gene needed to create a protein. 8. why is a frameshift mutation usually more serious than a substitution mutation? a it can be passed on to offspring. b it changes every codon after the mutation. c it always causes some form of cancer. d it causes duplication of genetic instructions. 9. study the karyotype below. how is this karyotype best characterized? a an abnormal female karyotype b an abnormal male karyotype c a normal female karyotype d a normal male karyotype

Explanation:

Question 6:

A point - mutation in a blood cell affects the DNA sequence which can lead to incorrect protein - coding. Since blood cells are somatic cells, traits won't be passed to offspring.

Question 7:

A frameshift mutation in the gene for hexosaminidase A causes a defect in the gene needed to create the protein, leading to Tay - Sachs disease.

Question 8:

A frameshift mutation changes the reading frame of the genetic code, altering every codon after the mutation site, which is more serious than a substitution mutation that usually affects only one codon.

Question 9:

The karyotype shows 22 pairs of autosomes and two X chromosomes, which is characteristic of a normal female karyotype.

Answer:

A. incorrect coding for a protein
D. The frameshift mutation causes a defect in the gene needed to create a protein.
B. It changes every codon after the mutation.
C. a normal female karyotype