The intermediate color or rather condition, in this case "roan", is a result of two alleles being codominant. Codominance occurs when the phenotype (or the physical expression of the gene) of a heterozygote individual expresses both the alleles in a pair of genes. In the given situation, both parents are homozygotes.
I think the roots are the most important part of a plant because without the roots the stem and leaves would have no job
Answer:
by crossing the sheep with a homo-zygous recessive sheep for “fluff” alleles
Explanation:
In genetics, the term homo-zygous refers to an individual that carries two copies of the same gene variant or 'allele' for a given gene. An individual that is homo-zygous dominant carries two copies of the same dominant allele. A dominant allele is a gene variant that can mask the expression of a recessive allele in heterozygous individuals (i.e., individuals that carry one copy of the dominant allele and one copy of the recessive allele). In a test cross, an individual that is suspected to be heterozygous for a given gene is crossed with a homo-zygous recessive individual in order to examine the phenotypes of the offspring. In this case, if the sheep that is suspected to be heterozygous (i.e., hybrid) is really heterozygous for the fur gene (genotype Ff), then the phenotypic ratio of the testcross progeny (F1) would be 1:1, i.e. 50% of the F1 individuals would have the 'dominant fluffy fur' phenotype (genotype Ff) and 50% of the F1 individuals would have the 'recessive non-fluffy fur' phenotype (genotype ff). Conversely, if the sheep that is suspected to be heterozygous is homo-zygous dominant for the fur gene (genotype FF), then 100% of the F1 individuals would have the 'dominant fluffy fur' phenotype (genotype Ff).
After the G2 phase, the cell goes thru another growth period. The cell will gather energy in order to prep for whats coming: Mitosis. The first phase of mitosis is Prophase. During Prophase, the chromatin fibers condense and shorten to chromosomes that can now be seen with aid from a light microscope. Microtubules also appear and prepare to hold sister chromatic im correct alignment for separation. Metaphase is the second phase. Microtubules align sister chromatids at the exact center of the mitotic spindle aka metaphase plate. The following step is Anaphase. The centromeres split, separating the 2 identical sister chromatids. Once the chromatids are separated, they are called chromosomes. Telophase comes after anaphase. It is the final stage of mitosis. The identical sets of chromosomes are now at opposite sides of the cell. The nuclear envelope now re-forms around each mass of chromosomes, nuclei reappear within each nucleus. After these phases, Cytokenisis occurs. This is the division of the cell's cytoplasm and organelles into 2 cells. A cleavage furrow is formed during Anaphase.
