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:
B
Explanation:
Because the roots of the tree were what where controling the erosion
Hope this helps :))
<span>an animal whose mouth develops from a second opening in the early embryo, opposite to the initial opening blastopore of the rudimentary gut. Chordates and echinoderms are deuterostomes.</span>
Answer:
Answer is E. Apply a thin layer of lotion on the skin from the neck to the soles of the feet.
Explanation:
Scabies are described or known to be small bugs that burrow and found crawling under the skin. They lay eggs and continue to multiply under the skin.
They cause rash on the skin and severe or intense itching, which normally get worse in the night.
The lindane lotion , when applied on the skin, goes through or enters the skin, and kills the scabies and their eggs.
The scabies do not affect the face of adults and older children.
