The answer would be A.
Glass mirrors, fragile items, and ignoring building codes are all dangerous.
The correct answer is (d) all of the above.
The most important phenomenon of the earth's crust is that it is not stable. It keeps on changing with respect to time called as continental shift. Continental shift squashes and changes a continent in such a way that it is very hard to find out its early history. Continental shift results in earthquakes, volcanoes and tsunamis. The movement of tectonic plates is the main reason for continental shift which leds to the natural calamities such as volcanoes, earthquake and tsunami on the local environment.
Red-green color blindness is due to a mutant gene in the X chromosome. An XX female with normal color vision and an XY male with normal color vision have a child with karyotype XXY who is color blind. The likely explanation is that the:_--------.
father was heterozygous for the color-blindness mutation.
mother was heterozygous for the color-blind mutation.
father had CNV of the color-blind mutation.
mother had CNV of the color-blind mutation.
None of the other answer options is correct.
Answer:
mother was heterozygous for the color-blind mutation.
Explanation:
Colorblindness is a recessive disorder. This means that it is expressed only in homozygous genotypes. The responsible gene is present on the X chromosomes. A colorblind female would have the genotype X^cX^c where c is the recessive allele of the gene present on the X chromosome responsible for color blindness. A female with genotype X^cX would have normal visible but would serve as a carrier.
Both the female and the male have normal genotype. Since they had a colorblind child, it means that the female was a heterozygous carrier for the trait and imparted the responsible allele to the child. The male can not serve as a carrier for X linked recessive disorder since they have only one copy of the X chromosome. Therefore, the female was a heterozygous carrier.
