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irina1246 [14]
3 years ago
5

What would be a symptom of an under-producing lacrimal gland?

Biology
2 answers:
topjm [15]3 years ago
8 0

Answer:

Dry eyes

Explanation:

The lacrimal glands are two glands, one for each eye, that produce the aqueous layer of the tear film. The lacrimal glands produce tears which then flow into canals that connect to the lacrimal sac. From this sac, the tears drain through the lacrimal duct into the nose. A symptom of an under-producing lacrimal gland would be dry eyes.

melomori [17]3 years ago
6 0
A symptom would be dry eyes, since this is the gland in your eye that produces tear film.
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a. Autosomal dominant means that even having one copy of the allele T will produce a tune deaf individual. The evidence of this is that individuals II.3 and 4 have children (III. 8 and 9) with normal tune perception. This suggests that they have inherited the normal allele from both parents. That means II.3 and II4 must be heterozygous, in order to pass on the normal allele. This makes sense if tune deafness is dominant (because 3 and 4 will both be Tt and Tt, so can pass on the t alleles). However, if tune deafness was recessive, that would mean that individual II 3 and 4 both have to carry 2 copies, meaning there is no way their children would have normal tune perception.

b. Since individual 5 is unaffected and we know this is the recessive trait, they must be Tt. Since individual 6 is affected, they must be either Tt or tt. However, they have children who are unaffected (11, 12, 13) who must be tt. This means, individual 6 must have the t allele to pass on, and must be Tt. Therefore, the cross between individuals 5 and 6 is tt x Tt:

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