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Chapter 12: Q. 16 (page 327)

A farmer raises black and white chickens. To his surprise, when the first generation of eggs hatch all the chickens are black with white speckles throughout their feathers. What should the farmer expect when the eggs laid after interbreeding the speckled chickens hatch?

a. All the offspring will be speckled.

b. 75% of the offspring will be speckled, and 25% will be black.

c. 50% of the offspring will be speckled, 25% will be black, and 25% will be white.

d. 50% of the offspring will be black and 50% of the offspring will be white.

Short Answer

Expert verified

The correct option is C.

Step by step solution

01

Step. 1 Introduction

Codominance seems to be a mode of dominance in which the progeny resemble both parents due to genetic blending.

02

Step. 2 Explanation for correct option.

Co-dominance is demonstrated by the alleles for black and white. For speckled hens, the parent's genotype after F1 generation will become Bb. A cross amongst two specked individuals would result in BB, Bb, Bb, bb. Thus. option c is correct.

03

Step. 3 Explanation for incorrect option. 

Option a. If all the offspring will be speckled, this will be the case of dominance.

Option b. As the given question is a case of co-dominance, 75% of the offspring will be speckled, and 25% will be black will not be possible.

Option d. As the given question is a case of co-dominance, 50% of the offspring will be black and 50% of the offspring will be white.

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Most popular questions from this chapter

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

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

Mendel performs a cross using a true-breeding pea plant with round, yellow seeds and a true-breeding pea plant with green, wrinkled seeds. What is the probability that offspring will have green, round seeds? Calculate the probability for the F1 and F2 generations.

The ABO blood groups in humans are expressed as the I A , I B , and i alleles. The I A allele encodes the A blood group antigen, I B encodes B, and i encodes O. Both A and B are dominant to O. If a heterozygous blood type A parent (I A i) and a heterozygous blood type B parent (I B i) mate, one quarter of their offspring will have AB blood type (I A I B ) in which both antigens are expressed equally. Therefore, ABO blood groups are an example of:

a. multiple alleles and incomplete dominance

b. codominance and incomplete dominance

c. incomplete dominance only

d. multiple alleles and codominance

Mendel performed hybridizations by transferring pollen from the _______ of the male plant to the female ova.

a. anther

b. pistil

c. stigma

d. seed
See all solutions

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