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Chapter 12: Q. 28 (page 328)

Can a human male be a carrier of red-green color blindness?

Short Answer

Expert verified

Males are just not primarily characterized as carriers of red-green vision problems.

Step by step solution

01

Step. 1 Introduction

The most prevalent kind of color deficiency is red-green colour impairment. One may very well have trouble recognizing various shades of red, green, and yellow if you do have this form of color vision. Deuteranopia is also a term for this.

02

Step. 2 Explanation

No, males cannot be the carriers of red-green color blindness, as color blindness is X-linked. Only females with two Xc genes become colorblind in both directions. Only the combination of color-blind males and a color-blind or carrier woman may result in this case. Because males lack a second X chromosome that may conceal the characteristic, all males having an Xc gene shall become colorblind in both red and green.

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Most popular questions from this chapter

A heterozygous pea plant produces violet flowers and yellow, round seeds. Describe the expected genotypes of the gametes produced by Mendelian inheritance. If all three genes are found on the same arm of one chromosome should a scientist predict that inheritance patterns will follow Mendelian genetics?

In Section 12.3, “Laws of Inheritance,” an example of epistasis was given for the summer squash. Cross white WwYy heterozygotes to prove the phenotypic ratio of 12 white:3 yellow:1 green that was given in the text.

People with trisomy 21 develop Down’s syndrome. What law of Mendelian inheritance is violated in this disease? What is the most likely way this occurs?

Imagine you are performing a cross involving seed color in garden pea plants. What F1offspring would you expect if you cross true-breeding parents with green seeds and yellow seeds? Yellow seed color is dominant over the green.

a. 100 percent yellow-green seeds

b. 100 percent yellow seeds

c. 50 percent yellow, 50 percent green seeds

d. 25 percent green, 75 percent yellow seeds

Figure 12.5In pea plants, round peas ( R ) are dominant to wrinkled peas ( r ). You do a test cross between a pea plant with wrinkled peas (genotype rr ) and a plant of unknown genotype that has round peas. You end up with three plants, all of which have round peas. From this data, can you tell if the round pea parent plant is homozygous dominant or heterozygous? If the round pea parent plant is heterozygous, what is the probability that a random sample of 3 progeny peas will all be round?
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