What is the best option from listed?

Can someone show me why this is correct? I will like to see the possible genotypes and phenotypes together that proves the answer.

Please write your complete solution (paper). Albinism in humans is inherited as a simple recessive trait. Determine the genotypes of the parents and their children when two normal parents have 3 normal children and 1 albino.

I Review Lesch-Nyhan syndrome (OMIM 300322) is a rare X-linked recessive disorder that produces severe mental retardation, spastic cerebral palsy, and self- mutilation. Part A What is the probability that the first son of a woman whose brother has Lesch-Nyhan syndrome will be affected? Express your answer as a fraction (example 1/16). Submit Request Answer Part B If the first son of the woman described in (a) is affected, what is the probability that her second son is affected? Express your answer as a fraction (example 1/16). Submit Request Answer

Mr. Chan's family consists of mom, dad and four kids. The parents have one daughter and one son together, another daughter is from the mother's previous marriage, and the other son is adopted. Here are the DNA analysis results: Mom Dad Child 1 = Child 2 Child 3 Child 4 I 1. Which child is adopted? Why? 2. Which child is from the mother's previous marriage? Why? 3. Who are the own children of Mr and Mrs Chan?

you can't choose two answers which one is it B or D?

Please help me with this question

Define the following a. triploblastic b. monoecious

A jar contains 4 red marbles numbered 1 to 4 and 10 blue marbles numbered 1 to 10. A marble is drawn at random from the jar. Find the probability of the given event. Write your answers as reduced fractions.(a) The marble is redYour answer is :   (b) The marble is odd-numberedYour answer is :   (c) The marble is red or odd-numberedYour answer is :   (d) The marble is blue and even-numberedYour answer is :

Tay-Sachs disease in humans is caused by a recessive allele. The disease is characterized by mental deficiency and blindness, with death occurring by 4 years of age. Among Ashkenazi Jews of central European ancestry, about 1 in 3600 children is born with the disease. Assume Hardy-Weinberg equilibrium and calculate the frequency of the Tay- Sachs allele in this population. Round your answer to the nearest 0.001. Type your answer...