Genetics Answers

If the male affected (sick) by color blindness marries the female with normal health (with homozygous genotype), what will be the offspring?

If the order of the genes on chromosomes before the chromosomal change was A-B-C-D-E-F-G and O-P-Q-R-S-T-U, while after the chromosomal change A-B-C-D-S-T-G and O-P-Q-R-E-F-U, what change the chromosomes have undergone?

if we cross 2 individuals with heterozygous genotypes for a certain trait that is inherited as dominant-recessive, the offspring will be characterized by?

An average egg production of a Flock is 200 eggs per year, Sire birds with average breeding value of 300 eggs were Selected. (Assume as if Heritability of egg production and generation interval is 0.3 and eight months respectively. For a given Flock of Birds determine : A) Genetic gain per generation.

B) Genetic Gain per year.

C) Average egg Production in next Generation.

Phenylketonuria is a metabolic disease due to a single recessive gene. Number of Babies born detected with it are 8 out of 8000 babies. Find out % of Carriers among the Population.

2.6) The genotype of F1 individuals in a tetrahybrid cross is AaBbCcDd. Assuming independent assortment of these 4 genes what are the probabilities that F2 offspring will have the following genotypes?

• AABBCCDD
• AaBBccDd

2.6) In corn plants, a dominant allele I inhibits kernel colour, while the recessive allele i permits colour when homozygous. At a different locus, the dominant allele P causes purple kernel colour, while the homozygous recessive genotype pp causes red kernels. If plants heterozygous at both loci are crossed, what will the phenotypic and genotypic ration of the offspring be?

2.6) Red colour in wheat kernels is produced by the genotype R-B-, white by the double recessive genotype (rrbb). The genotypes R-bb and rrB- produce brown kernels. A homozygous red variety is crossed with a white variety. What phenotypic results are expected in the F1 and F2?

In butternut varieties, white fruit colour is governed by a dominant allele (W) and yellow fruit colour by the recessive (w). A dominant allele at another locus (S) produces disc shaped fruit and its recessive allele (s) yields sphere shaped fruit. If a homozygous white disc variety of genotype WWSS is crossed with a homozygous yellow sphere variety wwss, the F1 are all white disc dihybrids of genotype WwSs.

1. If the F1 is allowed to mate at random, what would be the phenotypic ratio expected in the F2 generation.
2. If a heterozygous white disc variety of genotype is crossed with a homozygous yellow sphere variety, what would be the phenotypic ratio expected in the F1 generation?

2.6) If two animals heterozygous for a single pair of alleles are mated and have 200 offspring, about how many would be expected to have the phenotype of the dominant allele?