Question

Please answer all of the questions.

Spider-Man and Spider-Woman are planning to have children in the near future. Spider-Man is able to spin webs (S) and cling to walls (C), whereas Spider-Woman can spin webs but cannot cling to walls. If both of these traits are inherited in a dominant manner (i.e., the dominant trait will always mask the recessive trait), Spider-Man is heterozygous for each trait, and Spider-Woman is heterozygous for the web-spinning trait...

What would be the phenotypic ratio of the F₁ generation? Please note that: "S" = ability to spin webs; "NS" = cannot spin webs; "C" = ability to cling to walls; and "NC" = cannot cling to walls.

	a.	2 S/C : 6 S/NC : 6 NS/C : 2 NS/NC
	b.	4 S/C : 4 S/NC : 4 NS/C : 4 NS/NC
	c.	8 S/C : 2 S/NC : 2 NS/C : 4 NS/NC
	d.	6 S/C : 6 S/NC : 2 NS/C : 2 NS/NC
	e.	None of the above

In humans, the ability to roll one's tongue is a dominant trait (R). A woman who can roll her tongue is married to a man who cannot roll his tongue. The couple's daughter, Nia, can roll her tongue, but their son, Michael, cannot.

What is the genotype of the mother?

	a.	RR
	b.	Rr
	c.	rr
	d.	Either A or B
	e.	Either B or C

In humans, the ability to roll one's tongue is a dominant trait (R). A woman who can roll her tongue is married to a man who cannot roll his tongue. The couple's daughter, Nia, can roll her tongue, but their son, Michael, cannot.

What is the genotype of the father?

	a.	RR
	b.	Rr
	c.	rr
	d.	Either A or B
	e.	Either B or C

In humans, the ability to roll one's tongue is a dominant trait (R). A woman who can roll her tongue is married to a man who cannot roll his tongue. The couple's daughter, Nia, can roll her tongue, but their son, Michael, cannot.

What gametes does the mother produce?

	a.	R
	b.	r
	c.	R and r
	d.	Rr
	e.	RR

In humans, the ability to roll one's tongue is a dominant trait (R). A woman who can roll her tongue is married to a man who cannot roll his tongue. The couple's daughter, Nia, can roll her tongue, but their son, Michael, cannot.

What gametes does the father produce?

	a.	R
	b.	r
	c.	R and r
	d.	Rr
	e.	RR

In humans, the ability to roll one's tongue is a dominant trait (R). A woman who can roll her tongue is married to a man who cannot roll his tongue. The couple's daughter, Nia, can roll her tongue, but their son, Michael, cannot.

If Nia were to (one day) marry a man who was heterozygous for the tongue-rolling trait, what percentage of their children would be able to roll their tongues?

	a.	0%
	b.	25%
	c.	50%
	d.	75%
	e.	100%

In humans, the ability to roll one's tongue is a dominant trait (R). A woman who can roll her tongue is married to a man who cannot roll his tongue. The couple's daughter, Nia, can roll her tongue, but their son, Michael, cannot.

Imagine, for a moment, that the mother and father separate, and the mother decides to remarry. If her second husband is homozygous dominant for the tongue-rolling gene, what is the likelihood that their children (if they choose to have any) will be able to roll their tongues?

	a.	0%
	b.	25%
	c.	50%
	d.	75%
	e.	100%

In humans, the ability to roll one's tongue is a dominant trait (R). A woman who can roll her tongue is married to a man who cannot roll his tongue. The couple's daughter, Nia, can roll her tongue, but their son, Michael, cannot.

Imagine, for a moment, that the mother and father separate, and the mother decides to remarry. If her second husband is homozygous dominant for the tongue-rolling gene, what would be the genotypic ratioof their offspring (i.e., the F₁ generation)?

	a.	1 RR : 2 Rr : 1 rr
	b.	2 RR : 2 rr
	c.	2 RR : 2 Rr
	d.	2 RR : 1 Rr : 1 rr
	e.	None of the above

Characteristics (or traits) of an organism, such as those described in the examples above, are said to be heritable. In this context, the term "heritable" means...

	a.	Able to induce production of hair in various species
	b.	Traits that are most frequently seen within a given population early in development
	c.	The ability for traits to be passed down from parent to offspring
	d.	Traits that are only present when both parents are homozygous dominant
	e.	None of the above

Answer 1

Question 1

If trait is dominant it will show its character in heterozygous condition i.e in presence of other allele it will show its character

While if a trait is recessive it will show its character only in homozygous condition i.e in absence of dominant allele

Now given in the question spin web and cling to wall is dominant tarait hence a person heterozygous for this will show both trait Spiderman is heterozygous for both spin web and cling wall hence his genotype will be SsCc

Spiderwoman is heterozygous for spin web but cannot clingwall which means its recessive homozygous her genotype will be Sscc