Non-disjunction errors involving sex chromosomes sometimes occur in humans. A human with 3 sex chromosomes (for example, XXY or XYY) is male. A human with a single chromosome is female. A gamete with a single Y chromosome is not viable.
Which is the BEST argument for the connection between the number and types of sex chromosomes and their genetic effect?
A
Multiple Y chromosomes often determine biological gender
Genes on the Y chromosomes are essential for survival whether biological gender is male or female
с
Genes on the X chromosomes are essential for survival whether biological gender is male or female,
The two X chromosomes in females always segregate independently

the answer is d. chordata

the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

hope this : )

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.