Question

genes and inheritance Chap 7 s . How can an individual carry a defective gene but not exhibit the defective phenotype? a. An individual may not have that defective gene in every cell, and so appear normal b. Individuals carry two copies of gene instructions, and one dominant allele could mask the presence of a recessive defective allele c. Individuals are always homozygous d. Both a and c are true. e. None of the above is true. 4. 4. Mendel's law of segregation has its physical basis in which of the following phases of the cell cycle? a. the separation of homologous chromosome pairs in anaphase II of meiosis b. the orientation of homologous chromosome pairs in metaphase II of meiosis c. the orientation of homologous chromosome pairs in metaphase of mitosis d. the separation of homologous chromosome pairs in anaphase I of meiosis e. the orientation of homologous chromosome pairs in metaphase I of meiosis 5. 5. Which of the following statements about dominant traits is correct? a. The dominant trait is the one that is expressed. b. They are observed less frequently than recessive traits. c. They are observed three-fourths as frequently as heterozygous traits. d. They increase in frequency over evolutionary time. e. The dominant trait is typically masked by the recessive trait. Start: 10:09 PM Save Submit

Answer 1

Answer:

How can an individual carry a defective gene but not exhibit the defective phenotype? An individual may not have that defective gene in every cell, and so appear normal. Also, Individuals carry two copies of gene instructions, and one dominant allele could mask the presence of a recessive defective allele

4. 4. Mendel's law of segregation has its physical basis in which of the following phases of the cell cycle? The separation of homologous chromosome pairs in anaphase II of meiosis and the orientation of homologous chromosome pairs in metaphase II of meiosis

5. 5. Which of the following statements about dominant traits is correct? a. The dominant trait is the one that is expressed and they are observed three-fourths as frequently as heterozygous traits. Also, they increase in frequency over evolutionary time.

Explanation:

5.5 Dominant traits are always expressed and they mask the recessive trait, also they exhibit either dominant homozygous form (BB) or Dominant heterozygous form (Bb). over time their frequency tends to increase as a result of their domineering effect over recessive traits

4.4 The separation of homologous chromosome pairs in anaphase II of meiosis and the orientation of homologous chromosome pairs in metaphase II of meiosis best explains mendelian law of segregation.

Phenotypic characteristics are always expressed by all organisms, an organism with a defective gene n ot showing it phenotypically could be best explained in this regard; An individual may not have that defective gene in every cell, and so appear normal. Furthermore, Individuals carry two copies of gene instructions, and one dominant allele could mask the presence of a recessive defective allele

Answer 2

Answer:

a) B b) D c) A

Explanation:

Alleles exhibit dominance over each other leading to the dominant one being express and the recessive one not expressed. Alleles are  variants (different) genes that codes for a specific trait.

At Anaphase 1 homologous chromosomes separate leading to each being pulled to the opposite pole and the sister chromatids remain together while the homologs experience segregation.

Dominant trait is the one that is expressed. It usually exercise dominance over recessive trait until it is removed from the recessive trait and replaced with another recessive gene before it is expressed.