1 Possible 4 Genotypes Use Figure 3 to answer questions ag b

1. Possible 4 Genotypes?

Use Figure 3 to answer questions a-g below:

a) What is the genotype of the germ cell? _______

b) How many different alleles does the germ cell have? ______

c) Is the genotype of the germ cell homozygous or heterozygous? ___________

d) Write the genotypes of the gametes in the spaces provided in the figure above.

e) How many copies of Chromosome 1 does each gamete have? ____

f) How many alleles of Gene 1 does each gamete have? ____

g) How many gametes have the genotype A: ___/4= ___ % a: ___/4 = ___%

h) Now imagine that there is a female germ cell which also has the Aa genotype with respect to Gene 1.

How many different gamete genotypes will result from meiosis in the Aa female germ cell? _____

Figure 3 DNA Replication Metaphase I Homologous chromosomes align at metaphase plate Anaphase I Homologous chromosomes separate Metaphase ll Chromosomes align at the /AA A metaphase plate Anaphase II Sister chromatids separate GENOTYPES Gametes Germ Cell Genotype: Aa Haploid or Diploid? Diploid Diploid Diploid Haploid Haploid

Solution

a) What is the genotype of the germ cell? ___Aa____

b) How many different alleles does the germ cell have? _

there are two different alleles; allele \"A\" and allele \"a.\"

c) Is the genotype of the germ cell homozygous or heterozygous? _The genotype \"Aa\" is heterozygous___

d) Write the genotypes of the gametes in the spaces provided in the figure above: The gametes of the genotype Aa are, A and a.

e). Each gamete have one copy of chromosome 1

Allele is a particular form of gene, and they usually occur in pairs. In a diploid cell nucleus, each homologues chromosome contains two alleles. If both the alleles are same in the individual, then the individual is said to be “homozygous,” and if the each allele is different, then the individual is said to be “heterozygous.”