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Duplication of an ancestral opsin gene occurred in the primate lineage (Old World primates) and subsequent mutations in the new copy resulted in two types of opsin, instead of just one.
<span>Opsins are a group of light-sensitive proteins found in photoreceptor cells (cone cells) of the retina and they are the primary photopigments in primate eyes. Opsins are involved in vision, mediating the conversion of a photon of light into an electrochemical signal, the first step in the visual transduction cascade.</span>
<span>The difference in colour vision between New and Old World primates results from differing arrangements of the photopigment genes on the X chromosome. <span>In Old World primates the three photopigments are required for trichromatic colour vision and they are encoded by two or more X-chromosome photopigment genes and an autosomal photopigment gene. New World monkeys typically have only one X-chromosome pigment gene</span>.</span>
Answer:
A flower can either be classified as a monocot or a dicot depending on the number of petals present on the flower.
Explanation:
- Monocot also known as monocotyledon are characterized by the presence of one sees leaf(cotyledon) inside the embryo
The seed leaf is often thin because the endosperm which is required to feed the young plant is not found inside the seed leaf. In monocot flower a the number of petals is 3 or a multiple of 3. Examples of monocot flowers include; Asparagales, Wedges, Bromeliads, Poles.
- Dicots also known as dicotyledons are flowering plants that have two seed leaf. In a dicot flower the number of petals is 4 or 5 or a multiple of 4 or 5. Examples of dicot flowers include; Roses, Magnolas, Sunflower, Geranium.
The answer is <span>A) All future somatic cells of the organism will contain the (2n + 1) number of chromosomes.
An egg cell and a sperm cell fuse to develop a new organism in a process called a fertilization. As a result, a zygote is formed. When the </span>egg cell containing the (n+1) number of chromosomes combines with a sperm cell containing the (n) number of chromosomes, the zygote will have (n + n + 1), which is (2n + 1) number of chromosomes. The zygote is the first cell of the new organism. It undergoes mitosis resulting in somatic cells where all of them will contain the same <span>number of chromosomes as the zygote, which is (2n + 1)</span>
I think the correct answer from the choices listed above is option D. <span>Astronauts and scientists conduct research studies aboard the International Space Station in a satellite that was built by sixteen nations. Hope this answers the question. Have a nice day.</span>
