Answer:
The sternum, thoracic vertebrae, and ribs protect the heart and lungs.
Explanation:
The skeleton can be divided into the <em>axial skeleton</em> (the skull and the vertebral column), <em>visceral skeleton</em> (ribs and sternum) and the <em>appendicular skeleton</em> (extremities).
The function of the <em><u>visceral skeleton</u></em> is to <em>support and protect</em> the first portion of the digestive and cardio-breathing apparatus.
In mammals, the second part of the vertebral column (thoracic vertebrae), the ribs and the sternum delimitate a protective box for lungs and heart.
Answer:
Explanation:
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The <em>TYR </em>gene is responsible for the production of the enzyme tyrosinase which is crucial in the production of melanin which is primarily responsible for skin pigmentation and for pigmentation of other organs. In albinism, there is mutation of the <em>TYR </em>gene therefore there will be no transcription of DNA to mRNA and no translation of mRNA to the enzyme tyrosinase leading to its deficiency. The deficiency of tyrosinase will eventually lead to the absence of melanin and ultimately, the absence of pigmentation in an organism.
Answer:
6 chromosomes each
Explanation:
Meiosis is the cell division that results in daughter cells with a reduced number of chromosomes (by half). Meiosis is used only by sexually-reproducing organisms to produce gametes. Since meiosis reduces the chromosomal number, it occurs in a two-step division process viz: Meiosis I and Meiosis II.
Meiosis I involves separation of homologous chromosomes (similar but non-identical chromosomes received from each parent). In the Anaphase stage of meiosis 1, each homologous pair of chromosomes that makes the organism diploid (2n) is separated. Hence, the resulting cells of meiosis I will have a reduced chromosome number (haploid,n).
In this case of a diploid frog with 12 number of chromosomes. If a germline cell or reproductive cell divide by meiosis, in meiosis I, each pair of the 6 pairs of homologous chromosomes of the frog will separate into opposite cells. Hence, at the end of meiosis I, each daughter cell will have 6 chromosomes in a haploid state.
In meiosis II, sister chromatids (replicated chromosomes) separate instead. Each separated chromatid becomes a full chromosome in each gamete.
