Avancerad sökning

Hittade 2 uppsatser som matchar ovanstående sökkriterier.

1. 1. Exploration of the hereditary cause of sex ratio distortion in horses

   Master-uppsats, SLU/Dept. of Animal Breeding and Genetics

   Författare :Susan Ott; [2021]
   Nyckelord :Sex ratio; horse; selfish genetic elements; meiotic drive; Icelandic horse; Standardbred horse; Coldblooded trotters; heritability; Trivers-Willard hypothesis; pedigree data;

   Sammanfattning : Even sex ratios are seen as evolutionarily stable and are maintained by a selection against a skewed sex ratio. However, sometimes sex ratios at birth are skewed towards one sex. Reasons for this phenomenon are often unknown. LÄS MER

3. 2. Does size matter? : A study on pollen size distribution and pollen viability in Silene latifolia and S. dioica

   Master-uppsats, Uppsala universitet/Växtekologi och evolution; Uppsala universitet/Institutionen för biologisk grundutbildning

   Författare :Elliot Örjes; [2021]
   Nyckelord :Silene latifolia; silene dioica; pollen size; pollen tube; pollen viability;

   Sammanfattning : Pollen size dimorphism, i.e., when a plant produces more than one size of pollen, has been observed in several plant families but the underlying mechanisms have rarely been discussed. One of the hypotheses is that the smaller pollen produced by individuals with bimodal pollen size distributions are dead or non-viable. LÄS MER