Genetics Exam 1- Final exam

Assuming Mendel/s principles, if a heterozygote is test-crossed the genotypic ratios would be:

Assuming Mendel's principles, if a heterozygote is selfed and the phenotypic ratio is 1:2, what could explain this?

Comb shape in chickens represents one of the classic examples of gene interaction. Two gene pairs interact to influence the shape of the comb. The genes for rose comb (R) and pea comb (P) together produce walnut comb. The fully homozygous recessive condition (rrpp) produces the single comb. Assume that a pea-comb chicken is corssed with a walnut-comb chicken and the following offspring are produced: 30 walnut, 15 rose, 9 pea and 2 single.

What are the probable genotypes of the parents

Comb shape in chickens represents one of the classic examples of gene interaction. Two gene pairs interact to influence the shape of the comb. The genes for rose comb (R) and pea comb (P) together produce walnut comb. The fully homozygous recessive condition (rrpp) produces the single comb. Assume that a pea-comb chicken is corssed with a walnut-comb chicken and the following offspring are produced: 30 walnut, 15 rose, 9 pea and 2 single.

What are all the genotypes from such a cross?

You testcross a pea plant with genotype TtWw. What fraction of the offspring will have the genotype TtWw, assuming Mendel/s principles.

How many different gamete are possible from an organism with genotype AABBDd, assuming Mendel's principles?

Use the following for 8-10.
Green hair is autosomal dominant to blue hair and the trait is coded for by one. A gene haired alien has children with a green haired alien and they have a blue haired alien child. Use the following answers. You can use 1 answer more than once. Assume Mendel's principles.

What is the probability that their next child has blue hair and is a male?

Use the following for 8-10.
Green hair is autosomal dominant to blue hair and the trait is coded for by one. A gene haired alien has children with a green haired alien and they have a blue haired alien child. Use the following answers. You can use 1 answer more than once. Assume Mendel's principles.

What is the probability of getting a green haired alien, then a blue haired alien and then a green haired alien?

Use the following for 8-10.
Green hair is autosomal dominant to blue hair and the trait is coded for by one. A gene haired alien has children with a green haired alien and they have a blue haired alien child. Use the following answers. You can use 1 answer more than once. Assume Mendel's principles.

What is the probability of getting only 2 out of 6 aliens with green hair?

Mome has blood type B and baby Joe has blood type O. What blood type can the boy's father not have?

Before interphase human germ cells are 2C and 2n, and after the mitotic cell cycle the end products are 2C and n

Before interphase human germ cells are 2C and 2n , and after meiosis 1 the end products are

A women who is homozygous for hemophilia has children with a man who has hemophilia.

What is the probability that they will have a normal child?

A women who is homozygous for hemophilia has children with a man who has hemophilia.

What is the probability that they will have an affected daughter?

A women who is homozygous for hemophilia has children with a man who has hemophilia.

What is the probability that their next three children will have hemophilia?

If a female is a heterozygote for a X-linked disease she may show the disease because...

18. What is the mode of inheritance for colorblindness?
19. What is the mode of inheritance of maleness?
20. What is mode of inheritance of PKU (phenylktonuria)?

Answer the first one and just read the explanation for the answers to 19 and 20.

A bald man and a non-bald women have a non-bald son and bald daughter, what is the probability that heir next child will be a non-bald daughter?

A gene has 9 alleles in a population. How many different genotypes are possible, assuming Mendel's principles?

In a Chi-squared test, as the value of the X^2 increases, the likelihood/probability of rejecting the null hypothesis -------. Use the a table. Too lazy to post it in here.

In a chi-squared test, if the X^2 value is found at a Probability (p value) of more than 0.05, then you would fail to reject the null hypothesis

Two individuals with Huntington's disease want to have a child and you are the genetic counselor. What do you advice them about the probability that they will have an affected child?

If a mutation in a gene gives rise to many different unrelated phenotype, this is called:

Human -------- pass their---------to----------

In a strand of Drosophilia, purple eyes are dominant to yellow eyes and eye color is X-linked. What insects could you cross to ensure 100% purple eyed progeny?

For Questions 30-33, choose from the following answers. You can use one answer more than once.

30 will be the correct answer for this question. See explanation for 31-33 answers
30. The synaptonemal complex is found in-----
31. The sister chromatide undergo separation during-----
32/ The homologues pair up during------
33. the homologues separate during------

Polar microtubules connect with the centromeres.

The house fly, Musca domestica, has a haploid chromosome number of 8. How many chromatids should be present in a diploid, somatic, metaphase cell?

Crossing over/recombination occurs during pachytene of Prophase 2.

Genes A and B are 20 cM apart and are in replusion. Suppose that a double heterozygote is test-crossed, what percentage of offspring would have the aaBb phenotype?

If the calculated Rf value from a dihybrid testcross was 0.5, then

If two genes C and D are linked, then the expected genotypic ratio of progeny after a testcross of a double heterozygote is:

In the testcross expeirments, the frequency of recombination between genes a and b is 0.5, between b and c is 0.2, between a and c is 0.3 and between b and d is 0.1. what is the order of all four genes?