Parents that are heterozygous for having freckles (dominant) are crossed. which represents the ratio of their offspring?
twenty-five percent have freckles.
twenty-five percent are ff.
seventy-five percent have freckles.
seventy-five percent are ff.

Seventy-five percent (75%) have freckles.

Explanation:

This is a cross involving a single gene coding for possession or not of freckles in humans. According to the question, possessing freckles (allele F) is dominant over not possessing it (allele f). Therefore, a heterozygous human will have a Ff genotype and possess freckles.

Crossing two heterozygous parents will result in four possible offsprings as follows: 1 offspring will be homozygous dominant (FF), 2 offsprings will be heterozygous dominant (Ff), 1 offspring will be homozygous recessive (ff). The two dominant offsprings i.e. 3 of the offsprings (FF and Ff) will phenotypically possess freckles, Hence, the percentage of offsprings that have freckes is 3/4 × 100 = 75%. (See attached image)

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.

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.