Question in English:
A female carries a recessive lethal gene (l) on one of her X chromosomes, and a normal dominant allele (L) on the other. What is the sex ratio to be expected in this woman's dependency if she marries a normal man?
Answer:
2/3 females
1/3 males
Explanation:
Females have two X chromosomes (XX) and males have an X and a Y chromosome (XY).
The genotype of the female is XLXl. The genotype of the male is XLY, since he is normal.
The possible genotypes are:
<u> XL Xl</u>
<u>XL</u> <em>XLXL XLXl</em>
<u>Y</u> <em>XLY </em><em>XlY</em>
<em />
All female offspring will be normal as they will always have one normal copy of the X chromosome from their father.
50% of the male offspring will be normal, but 50% will inherit the lethal gene from their mother.
Because the allele is lethal, that means XlY males will not be born.
That means 2/3 of the children will be females, and 1/3 will be males.
Answer:
The well labelled diagram of a fern plant in division Pteridophyta.
The flow of <u>DNA → mRNA → protein </u>depicts the flow of information when a gene directs the synthesis of a cellular component.
Explanation:
Genetic information needs to flow in a specific pattern in order a gene to transform into a component like protein. This transformation takes place through the processes of transcription inside the nucleus and translation in the ribosomes. So the pathway: DNA → mRNA → protein will be correct flow of information for protein synthesis from DNA code. The mRNA or the messenger RNA encodes the genetic information or the chemical blueprint of the particular protein to be synthesized. This flow represents the central dogma of genetic information pathway or flow, which is; DNA encodes the RNA and the RNA encodes the Protein
