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bronzeimpala181Lv1

28 Sep 2019

83. (Application question) The presence of freckles (F) isdominant to the absence of freckles (f). Using Punnett squares,determine the phenotypic and genotypic ratios that you would expectfrom the following crosses: a. Parent 1: Homozygous dominant (FF)Parent 2: Homozygous recessive (ff) b. Parent 1: Heterozygous (Ff)Parent 2: Homozygous recessive (ff) c. Parent 1: Homozygousrecessive (ff) Parent 2: Homozygous recessive (ff) d. Parent 1:Heterozygous (Ff) Parent 2: Heterozygous (Ff)

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Casey DurganLv2

30 Sep 2019

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1.) This summer, there was a surge in the number of albino children killed for their body parts in the African country of Malawi (yes, it's bizarre but sadly true: http://goo.gl/8o0imm and http://goo.gl/DK0r8M). Albinism in humans is inherited as a simple recessive trait. Assuming that two non-albino (normal) parents have five children, four of which are normal and one of which is albino, which of the following statements is true? Select all that apply (you must select all correct answers to get credit). Assume that 'A' indicates the non-albino allele and 'a' indicates the albino allele.

Multiple answers:You can select more than one option

A)The 4 normal children are heterozygous Aa

B)At least one of the normal siblings must be homozygous AA

C)The frequency of albino children is as expected for Mendelian inheritance

D)One of the parents cannot be Aa

E)One third of the normal children expected to be AA while the others Aa

2.)

Albinism in humans is inherited as a simple recessive trait. Assuming that a normal male and an albino female have 6 children, all normal, which of the following statements is true? Select all that apply (you must select all correct answers to get credit).

Multiple answers:You can select more than one option

A)The father could be heterzygous for the trait

B)The probability that all the children are heterozygous for the trait is (1/2)^5 = 1/32

C)The father cannot be Aa

D)The children should all be heterozygous for the trait

E)One would expect about 2/3 of the normal children to be Aa

F)The father must be AA

3.)

Given an albino male mating with a normal female to produce 3 normal children and 3 albino children, which of the following of Mendel's postulates are not being demonstrated by this particular scenario? Select all that apply (to get credit, all your choices must be correct).

Multiple answers:You can select more than one option

A)Postulate of segregation

B)Postulate of dominance

C)Postulate of independent assortment

D)Postulate of unit factors

4.)

Consider the cross: Ee ff Gg HH x Ee Ff gg HH (assume these are designations for genes that are inherited in a Mendelian fashion). What is the probability that a single offspring from this cross would be genotypically: ee Ff Gg HH or Ee ff gg HH?

A)1/16

B)1/32

C)9/64

D)1/6

E)3/16

F)27/64

G)1/64

H)3/64

I)1/8

J)3/8

1. In the fruit fly, Drosophila melanogaster, the normal wildtype has long wings and red eyes (both are dominant traits).Recessive forms of these genes result in vestigial wings and browneyes. A red-eyed, vesigial winged male is crossed with abrown-eyed, long winged female.

(a) Assuming each parent is homozygous for the dominant alleles,write out the cross and give the genotype and phenotype of theoffspring.

(b) If each parent is a heterozygote for the dominant alleles,what are the genotypes, phenotypes and ratios of the potentialoffspring?

2. In peas, the allele for tall plant (T) is dominant to theallele for short plants and the allele for purple flowers (P) isdominant to white flowers (p). Write out the results of thefollowing crosses and determine the phenotypic ratios for each:

(a) TtPp x TtPp

(b) Ttpp x ttpp

(d) TTpp x ttPP

burgundytiger789

1. A chi-square test was performed and indicated that theobserved numbers of offspring were significantly different from theexpecteD. Which of the following P-values would support thisconclusion?

Select one:

a. 0.536

b. 0.752

c. 0.024

d. 0.159

e. 0.995

2.A couple has six daughters and is expecting a seventh chilD.What is the probability that this child will be a boy?

Select one:

a. 1/4

b. 1/64

c. 1/2

d. 1/16

e. 1/128

3.Freckles are caused by a dominant allelE. A man has frecklesbut one of his parents does not have freckles. What is hisgenotype?

Select one:

a. Homozygous dominant

b. Heterozygous

c. Homozygous recessive

d. Homologous

e. Heterologous

4.Freckles are caused by a dominant allelE. A man has frecklesbut one of his parents does not have freckles. The man has fathereda child with a woman that does not have freckles. What is theprobability that their child has freckles?

Select one:

a. 2/3

b. 1/2

c. 1/4

d. 1/3

e. 3/4