Answer: a-Male cones are smaller than female cones.
The cones are the characteristics of the gymnosperms plant species specifically to the Conifers. These plants exhibit naked ovules and the pollination in these cones is aided by the wind pollination. The male cones are smaller than the female cones and grows on the lower branches of the trees whereas the female cones grows on the higher branches. Each bract or scale of the male cone exhibit numerous pollen grains which are blown away by the wind and they pollinate the ovules of the female cones. Each bract or scale of female cone exhibit an ovule at the lower end. Each ovule is fertilized by the pollen to form the seed.
Answer:
Evolution is change in the heritable characteristics of biological populations over successive generations.
Explanation:
Answer:
Since the female parent is homeozygous, whichever allele the males get, they will receive a red-eye allele. Females are red-eyed because the presence of the recessive copy is masked. Males are red-eyed because they only have one copy of the gene, and that copy is for the red allele.
Explanation:
All of the following activities occur in the course of prophase in mitosis except crossing over.
Mitosis may be divided into 4 stages: prophase, metaphase, anaphase, and telophase.
Throughout prophase, the chromatids condense into chromosomes, thereby making them seen. The mitotic spindle is a structure composed of microtubule proteins that segregate the chromosomes in mitosis. This shape is formed in prophase.
In Prophase homologous pairs of chromosomes are paired together. In metaphase, these chromosomes are lined up at the equator of the mobile, and sister chromatids are connected to the spindle fiber.
Crossing over (or recombination) is the alternate of genetic cloth between non-sister chromatids that occurs in the course of prophase I of meiosis.
In end, condensation of DNA, the pairing of chromosomes, and, spindle formation arise for the duration of prophase, while crossing over occurs in prophase I of the meiotic cellular department (choice B).
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