The genes present on the chromosomes have alleles. They define the phenotypic and genotypic traits of the person. The types of alleles include dominant and recessive condition, which are depicted by a capital letter and a small letter for, example B for a dominant allele and b for a recessive allele of a gene. The combination of both the genes after recombination defines the phenotype or the external expression of the characters of a particular person. The dominant allele of a gene expresses to form a protein, whereas the recessive allele does not express and is not involved in the phenotypic expression of the characters of a person. The recessive allele is expressed only in the homozygous recessive state, when the genes for the dominant phenotype are not present.

Question

Want to see the full answer?

Answer 1

Question

Chapter 9, Problem 4SQ

Summary Introduction

Introduction: The genes present on the chromosomes have alleles. They define the phenotypic and genotypic traits of the person. The types of alleles include dominant and recessive condition, which are depicted by a capital letter and a small letter for, example B for a dominant allele and b for a recessive allele of a gene. The combination of both the genes after recombination defines the phenotype or the external expression of the characters of a particular person. The dominant allele of a gene expresses to form a protein, whereas the recessive allele does not express and is not involved in the phenotypic expression of the characters of a person. The recessive allele is expressed only in the homozygous recessive state, when the genes for the dominant phenotype are not present.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

The chart below is showing 4 generations of a family that is affected by a hereditary disease. a. Is the disorder being tracked dominant or recessive? How do you know? b. There is only one possible genotype for person C. True or False? c. What are the possible genotypes for person A? d. What are the possible genotypes for person B?, e. If two people with the same genotypes as person C's spouse and person A's spouse had a child, what is the probability that the child will be affected by this genetic disorder? (draw a Punnett square using the correct genotypes to help you). % chance offspring will be affected % chance offspring will not be affected

Duchenne muscular dystrophy is sex linked and usually affects only males. Victims of the disease become progressively weaker, starting early in life.a. What is the probability that a woman whose brother has Duchenne’s disease will have an affected child?b. If your mother’s brother (your uncle) had Duchenne’s disease, what is the probability that you have received the allele?c. If your father’s brother had the disease, what is the probability that you have received the allele?

In humans, a dimple in the chin is a dominant characteristic controlled by a single gene.a. A man who does not have a chin dimple haschildren with a woman with a chin dimple whose mother lacked the dimple. What proportion of theirchildren would be expected to have a chin dimple?b. A man with a chin dimple and a woman who lacksthe dimple produce a child who lacks a dimple.What is the man’s genotype?c. A man with a chin dimple and a nondimpledwoman produce eight children, all having the chindimple. Can you be certain of the man’s genotype?Why or why not? What genotype is more likely,and why?