The First genetic maps used genes as markers because please

The First genetic maps used genes as markers because:

please answer both questions with correct answer! thank you!

The First genetic maps used genes as markers because: Select one: a. The locations of genes on chromosomes could be observed by stining the DNA with dyes. X b. Phenotypes specified by genes could be visually identified and their inheritance patterns studied. c. Individual genes specifying easily identifiable phenotypic traits were easily cloned. d. Singel nucleotide polymorphisms were used to identify point mutations that resulted in clearly observable phenotypic differences. Eukaryotic Genomes are mapped using DNA markers in addition to genes because: Select one: a. DNA markers do not require the presence of two or more alleles for mapping b. Gene maps may not cover large regions of the genome c. Most genes contain multiple alleles that can be easily mapped X d. DNA markers are less variable than genetic markers

Solution

1. Option D is correct. The First genetic maps used genes as markers because single nucleodite plymorphism were used to identify any changes in gene.

2. Opttion A is correct