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Chapter 15: Q15.3-1CC (page 306)

When two genes are located on the same chromosome, what is the physical basis for the production of recombinant offspring in a testcross between a dihybrid parent and a double-mutant (recessive) parent?

Short Answer

Expert verified

Heterozygous parents produce the gametes with recombinant genotypes for the two genes. It takes place via crossing over in meiosis I. The recombinant phenotype is produced from the fertilization of the recombinant gamete from a double mutant parent.

Step by step solution

01

Description of chromosomes

The thread-like structure present in the cell nucleus with DNA wound in it is known as a chromosome. It is passed from the parent to the offspring. The genetic information is coded in it and passed to the offspring.

02

Description of recombinant offspring

The recombinant offspring are the offspring that possess different allele combinations compared to the parents. The recombination process produces recombinant offspring. The main aim of creating recombinant offspring is to increase genetic diversity.

03

Physical basis for the production of recombinant offspring

Meiosis is the type of cell division that takes place in the germ cells.Crossing over occurs in meiosis I. The similar DNA sequences present in chromosomes cross over each other, resulting in the formation of recombinants.

The crossing-over process takes place in the heterozygous parent resulting in recombinant genotypes. Double mutant parent produces the offspring with the recombinant gametes via the process of fertilization.

Hence, the crossing over is the mechanism that produces recombinant offspring.

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Most popular questions from this chapter

Pseudohypertrophic muscular dystrophy is an inherited disorder that causes gradual deterioration of the muscles. It is seen almost exclusively in boys born to apparently unaffected parents and usually results in death in the early teens. Is this disorder caused by a dominant or a recessive allele? Is its inheritance sex-linked or autosomal? How do you know? Explain why this disorder is almost never seen in girls.

A man with hemophilia (a recessive, sex-linked condition) has a daughter without the condition. She marries a man who does not have hemophilia. What is the probability that their daughter will have hemophilia? Their son? If they have four sons, what is the probability that all will be affected?

Assume that genes A and B are on the same chromosome and are 50 map units apart. An animal heterozygous at both loci is crossed with one that is homozygous recessive at both loci. What percentage of the offspring will show recombinant phenotypes resulting from crossover? Without knowing these genes are on the same chromosome, how would you interpret the results of this cross?

Two genes of a flower, one controlling blue (B) versus white (b) petals and the other controlling round (R) versus oval (r) stamens, are linked and are 10 map units apart. You cross a homozygous blue oval plant with a homozygous white round plant. The resulting F1 progeny are crossed with homozygous white oval plants, and 1,000 offspring plants are obtained. How many plants of each of the four phenotypes do you expect?

Which one of Mendel鈥檚 laws describes the inheritance of alleles for a single character? Which law relates to the inheritance of alleles for two characters in a dihybrid cross?
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