Answer:
A) stratum basale.
Explanation:
The epidermal layer consists of five layers. This is not having any blood vessels and known as avascular. The four-layer starting from stratum basale to stratum corneum is referred to as thin skin. But the skins of foot and palm has another layer called stratum lucidum. This layer forms the five layers of the epidermis.
The stratum basale is the deep layer of the epidermis. Below this layer dermis is present. This layer consists of basal cells which are precursors of keratinocyte cells. The stratum basale is a single layer cell and it undergoes continual mitosis. So that this cell produces new cells and these new cells replace the other older cells above it.
As the basal cells are precursors of keratinocytes, they produce all keratinocytes of the epidermis.
Two other types of cells are produced from this layer - Merkel cell, and melanocyte. Merkel cells act as touch receptors and melanocytes produce melanin pigments.
It looks like the respiratory and digestive systems.
Pectinate muscles are found on the internal walls of the right and left atria. The correct option is C.
<h3>What are pectinate muscles?</h3>
Pectinate muscles are ridge-like muscle elevations. They are parallel to each other and resemble comb teeth. They can be seen clearly inside the right atrium.
Pectinate muscles are found on the internal walls of the right and left atria.
Thus, the correct option is C.
For more details regarding pectinate muscle, visit:
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A phenotype is a physical characteristic which is visible. Hence when the resulting combinations have two dominant alleles or even one dominant allele, the dominant characteristic is exhibited. The recessive characteristic is exhibited only when both the alleles are recessive.
To find the ratio of phenotypes, we need to place the genotype of the father and mother in a grid form ( attached grid figure)
Here we have two Ff phenotypes which is dominant and two ff phenotypes which is recessive
Hence the ratio is 2:2 or 1:1
