Answer:
A single gene on the Y chromosome plays a crucial role in the parental development of the testes.
Explanation:
Y chromosome is present only in males and this chromosomes is the distinguishing factor which separates males from females. It is the smallest chromosome but of utmost importance due to its sex determining feature. Up till now, studies show that Y chromosomes only carry limited amount of genes.
The Y chromosome, most importantly, comprises of the SRY gene. This is the gene responsible for determining the testis and for the development of the testis. The SRY gene is responsible for sex determination.
B. distance and mass because as distance increases, the gravitational pull decreases and when it decreases, the gravitational pull increase. Also the mass increases, so does the attraction and opposite if it decreases.
1) The new blood cells are created in the in the bone marrow , located inside the bone .
2) stores fat
3)calcium
4) tough tissue
Catalyst speeds up chemical reactions
