Traits that are sex-linked are carried on
a. either the x or y chromosome
b. the y chromosome
c. the x chromosome

the correct answer for the blank is- A) either the X or Y chromosome.

Sex linked traits are those characteristics of an individual that are depicted by the genes, which are present on sex chromosome ( present within reproductive cells like sperm and egg).

There are two types of sex chromosomes that is X chromosome ( found in both makes and females ) and Y chromosome ( present only in males).

Thus, traits that are sex-linked are carried on either the X or Y chromosome .

the correct answer: the index of refraction of the second medium is lower i tried this persons answer and it was wrong this person is lying

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.