Question

1. What is the chromosome theory of inheritance?

2. Understand how independent assortment can cause gametes to have four combinations of alleles when an individual is heterozygous for two genes on two different chromosomes.

3. What are linked characters and linked genes? Understand why linked genes will not independently assort.

4. How can crossing over affect linked genes?

5. What are recombinant gametes?

6. Define recombinant frequency. Be able to use the recombinant frequency to determine how close two genes are on a chromosome.

7. What is a linkage map?

8. What is the function of the SRY gene on the Y chromosome? What happens if you don't have this gene?

9. Know how sex is determined in mammals, birds, bees and ants, and reptiles.

10. How many autosomes and sex chromosomes do normal human haploid and diploid cells have?

11. What does it mean for a gene to be X-linked or Y-linked?

12. Be able to answer word problems and fill out a Punnet square involving an X-linked recessive trait.

13. Which sex is more likely to have an X-linked recessive disorder? Understand why.

P.s The most simple answer would be preferable. I would be copping the notes over that you will provide to my noteb book and add my details to it.

Answer 1

1.

The chromosome theory of inheritance defines that the chromosomes are linear sequences of genes. This theory states that inheritance patters may be generally explained by assuming that genes are located in the specific sites on the chromosomes.

2.

When two alleles of a gene are identical than a individual is considered as homozygous for that trait. If there are two different alleles than the individual is heterozygous. Heterozygous pairs are made up of one dominant and one recessive alleles and only dominant allele is only able to express. Independent assortment produce gametes with the different traits that occur together and this cause gametes to have four combinations of alleles.

3.

The alleles on the same chromosome sharing close proximity are called linked genes. The frequency of closely situated genes to pass is very little and this is the reason that linked genes do not assort independently.

4.

When chromosomes cross over, two different chromosomes trade pieces of geneticinformation during prophase I of meiosis. If the linked genes are far apart on the chromosome, it is more likely that crossing over will separate them.

5.

Gametes produce after the crossing over are called as recombinant gametes.