Imagine that a human gene has been discovered that determine

Imagine that a human gene has been discovered that determines whether or not a person will display excessive uncontrollable channel surfing, and that the gene is maternally imprinted. The allele responsible for excessive uncontrollable channel surfing is a dominant allele (UCS). The recessive allele results in normal use of the TV remote control (ucs). A female is heterozygous for this gene, while her husband is homozygous dominant. What is the probability that they will have a child that will not suffer from excessive uncontrollable channel surfing? a. 0 b. 1/2 c. 1/4 d. 1/8 e. 1 Polydactyly is due to a dominant allele that is incompletely penetrate in heterozygote\'s. The Penetrance value for this trait is currently estimated to be 0.75. Two phenotypically normal individuals are heterozygous for this gene and considering starting a family. What is the probability that they will have a normal child? a. 0.125 b. 0.25 c. 0.375 d. 0.5 e. 0.75 A new mutant phenotype for wing color has been reported for Drosophila - transparent green wings. Wild type wings are colorless (and transparent). The mutant phenotype has been found to be the dominant phenotype. Which of the following correctly represents the wild type allele of this gene when Drosophila nomenclature is used? a. g b. c c. G^+ d. C^+ e. g^+ f. c^+

Solution

4.

UCSucs X UCSUCS

All the children are suffering fron excessive uncontrollable channel surfing. The probability of child not suffering from this disorder is 0. Option a is correct.

5.

Two heterozygous and phenotypically normal individuals considering to start family

Pp x Pp

The offspring produced are in 1:2:1 ratio.

The frequency of dominant allele = 0.75

The frequency of recessive allele = 1- 0.75 = 0.25

Since, the couple produce offspring in 1: 2:1 ratio, the probability of producing normal child is 0.75. Option e is correct.

6.

According to Drosophila nomenclature \'+\' sign indicates wild type. If \'G\' is considered as mutant genotype representing transparent green wings, then \'g⁺\' represent the wild type coloress and transparent wings. Option e is correct.

male / female	UCS	UCS
UCS	UCSUCS	UCSUCS
ucs	UCSucs	UCSucs