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9966 [12]
2 years ago
12

True/false: nerve tissue is found in the retina; the rods and cones in the back of the eye

Biology
1 answer:
professor190 [17]2 years ago
5 0
True :) they are found in The retina it’s a layer of nervous tissue that covers the inside of the back 2/3 of the eyeball
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A couple planning their family are aware that through the past three generations on the husband's side a substantial number of s
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a) There are lots of genes on chromosome 1 could be affected, and the gametes could be imbalanced (missing segments of DNA or whole chromosomes)

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c) No. I would advise that the couple undergo preimplantation genetic diagnosis, so that a zygote carrying the normal copy of chromosome 1 could be selected.

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Chromosome 1 is one of the largest and most gene rich chromosomes. An inversion that covers 70% of its length would cover lots of genes.

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This could explain the high incidence of past still births, as if lots of genes are affected, and non-functional, the pregnancy would be rendered non-viable, or highly deleterious causing premature death.

b) There is a 50% chance of a child inheriting the defective copy of chromosome 1 (and 50% of a chance of them inheriting the normal chromosome 1. Therefore, there is likely a 50% chance that future offspring would be affected by defects

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