Feather color in budgies is determined by two different genes, y and b, one for pigment on the outside and one for the inside of the feather. yybb, yybb, yybb or yybb is green; yybb or yybb is blue; yybb or yybb is yellow; and yybb is white.
a blue budgie is crossed with a white budgie. which of the following results is possible?

a) green offspring only
b) yellow offspring only
c) blue offspring only
d) green and yellow offspring
e) a 9: 3: 3: 1 ratio

Blue offspring only

Explanation:

If A blue budgie is crossed with a white budgie.

i.e yyBB or yyBb × yybb

let use yyBb for blue budgie,so we have; yB, yb, yB, yb representing the columns on the horizontal rows of the punnet square.

on the other hand, in white budgie yybb, we will have yb, yb, yb, yb representing the rows on the vertical column of the punnet square.

if a dihybrid cross occurs among these representative, all progeny in the punnet square will be yyBb, showing that they are all Blue offspring only.

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.