People with night blindness have difficulty seeing in dim light. The allele for night blindness, N, is dominant to the allele for normal vision, n. These alleles are not carried on the sex chromosomes.

Individual 12 is a boy. What is his phenotype?

What is the genotype of individual 1 ? Explain the evidence for your answer.

*What is the probability that the next child born to individuals 10 and 11 will be a girl with night blindness ? Show your working.

Note: Answer as many you want and have a great day

a is nn since he has normal vision.
If he had just one allele that was N he would be night blind.

b) night blindless

c) is 25% since the male is heterozygous, and the female is homozygous meaning that there is a 50% chance of having a nightblind child, this is reduced to 25% when you also have to get xx chromosomes.

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aliasger2709 aliasger2709 · Answer 2 · 2021-12-16T05:23:59-05:00

Inability to see clearly at night or in dim light is called night blindness. It is caused due to deficiency of vitamin A.

1. The boy will have nn genotype as he has normal vision. If he was heterozygote Nn then he would have night blindness as even one allele of night blindness N can cause the disease.

2. The genotype of individual 1 will be NN or Nn as the female is suffering from night blindness then she will have N allele either on both or single chromosome.

3. The probability that the next child born to individuals 10 and 11 will be a girl with night blindness will be 25%. This can be explained as:

Male is heterozygous and the female purebred for the night blindness trait therefore the female child born will have a 25% chance of having the disease.

To learn more about night blindness follow the link:

https://brainly.com/question/2716290