Question

I need help with gentics stuff.

11. Mendel predicted that there are “units of heredity.” We now know that this is a segment of DNA on a chromosome that codes for a particular trait is called a: gene

12. A version or variant of a gene that produces a specific trait is called an: allele

13. A recessive phenotype can only be displayed if the genotype is:

14. When the alleles on homologous chromosomes switch places during meiosis and create recombinant chromosomes, this is called:

15. When genes are located on the same part of the chromosome, do not assort independently, and get passed on together, the genes are said to be:

16. Most sex-linked genes are on the _X__ chromosome, simply because they are built of much more DNA.

17. Sex-linked traits are more common in _X chromosome__ than _the Y chromosome__.

Answer 1

11 and 12 seem to be right :) For 13, only organisms which are homozygotic for a certain gene (aa) express a recessive phenotype.
14. This dna exchange between the homologous chromosomes is called crossing-over.
15. geneticly linked or coupled, the phenomenon is known as genetic linkage
16. and 17. also seem all right :)