Answer:
0%
Explanation:
From the information given;
Assume that the dominant "B" allele encodes brown eyes ; and
the recessive "b" allele encodes blue eyes
If genotype BB × genotype bb, the percentage of chance that they would have children with blue eyes will be zero ...Let look at the cross
BB × bb
We have all the progeny as Bb, Bb, Bb, Bb ....i.e the genotypic information are all heterozygous brown eyes, this is because The allele B mask the recessive "b" allele which makes the allele B (brown eyes) to be dominant over allele b (blue eyes).
Answer: Option D.
Explanation:
The process of bone thickening starts with the formation of a template of the hyaline cartilage diaphysis from chondrocytes. Due to developmental signals the bone matrix begins to calcify. This calcification allows the prevention of nutrition diffusion into bone matrix and opens the cavities in diaphysis cartilage. Blood vessels enters into the cavities and osteoblasts and osteoclasts modifies calcified cartilage matrix into spongy bone. Osteoclasts allows the break down of spongy bone and forms a medullary cavity in diaphysis. Irregular connective tissue forms a periosteum (covers compact bone) around the bones and allows the attachment of bone to tissues, tendons, and ligaments. The bone then continues to grow and get thick.
Hence, the correct option is D.
Leaves are colored by molecules called pigments. The pigment that causes leaves to be green is chlorophyll. Chlorophyll is important for plants to make food using sunlight. During spring and summer when there is plenty of sunlight, plants make a lot of chlorophyll.
In autumn when it starts to get cold, some plants stop making chlorophyll. Instead, those plants break down chlorophyll into smaller molecules. As chlorophyll goes away, other pigments start to show their colors. This is why leaves turn yellow or red in fall.
Answer:
Two ways organisms join a population are birth rate and immigration. Two ways they leave are death rate and emigration.
The average human rate is 60 to 100 beats per minutes.
