If the expression of a trait requires only one copy of a gene (one allele), that trait is considered dominant. If the expression of a trait requires 2 copies of a gene (2 alleles), that trait is considered recessive. One exception is X-linked disorders.
Answer:
Lining up of chromosomes in the cell
.
Explanation:
Prophase begins with the Thickening of chromosome. Chromosomes are clearly visible inside the nucleus. each chromosome splits longitudinally to form two chromatids.
The centriole in the centrosome of animal cell divides into two. The centrosphere set the centrioles free. Centrioles develop very fine eye-lash like thread called aster rays. the two asters start moving towards the opposite poles. By the end of prophase they reach at the opposite poles.
<h3><u>Expansion of energy in active transport:</u></h3>
- Active transport is a transport process that involves movement of molecules between regions through a membrane against the concentration gradient.
- It is homeostatic process which means it’s a biological process in which functions of the body are regulated to achieve internal balance.
- Active transport uses metabolic energy ATP to transport molecules across a membrane.
- Generally, metal ions are transported across cell membrane by active transport.
- Metal ions are transported with the help of ion pumps and are distributed through the body.
Answer:
0.5
Explanation:
let the alleles be W- no white spots w-white spots
ww butterflies have white spots
genotypic frequency of ww= number of butterflies with white spots/total number
= 128/512
= 0.25
alleleic frequency of w= square root of genotypic frequency of ww
= square root of 0.25
= 0.5
